cms Live preview on a tree collection doesn't work if the entry has not been saved

Bug description

I believe the live-preview is failing because it's a tree collection, while live-preview on a standard collection does work if the entry has not been saved yet. If you save a draft then it does start to work correctly.

Screenshot 2021-12-24 at 11 42 48 Screenshot 2021-12-24 at 11 45 29

How to reproduce

Try using live-preview on a empty non-saved entry in a tree.

Logs

[2021-12-24 09:42:37] production.ERROR: Symfony\Component\HttpFoundation\Request::create(): Argument #1 ($uri) must be of type string, null given, called in /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Controllers/CP/PreviewController.php on line 42 {"userId":"689ae2aa-7236-4264-8ebd-7209424a4863","exception":"[object] (TypeError(code: 0): Symfony\\Component\\HttpFoundation\\Request::create(): Argument #1 ($uri) must be of type string, null given, called in /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Controllers/CP/PreviewController.php on line 42 at /Users/daniel/Code/cms/vendor/symfony/http-foundation/Request.php:334)
[stacktrace]
#0 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Controllers/CP/PreviewController.php(42): Symfony\\Component\\HttpFoundation\\Request::create(NULL)
#1 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Controllers/CP/Collections/EntryPreviewController.php(33): Statamic\\Http\\Controllers\\CP\\PreviewController->getDataResponse(Object(Illuminate\\Http\\Request), Object(Statamic\\Entries\\Entry))
#2 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): Statamic\\Http\\Controllers\\CP\\Collections\\EntryPreviewController->create(Object(Illuminate\\Http\\Request), Object(Statamic\\Entries\\Collection), Object(Statamic\\Sites\\Site))
#3 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction('create', Array)
#4 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Route.php(262): Illuminate\\Routing\\ControllerDispatcher->dispatch(Object(Illuminate\\Routing\\Route), Object(Statamic\\Http\\Controllers\\CP\\Collections\\EntryPreviewController), 'create')
#5 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Route.php(205): Illuminate\\Routing\\Route->runController()
#6 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Router.php(695): Illuminate\\Routing\\Route->run()
#7 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(128): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}(Object(Illuminate\\Http\\Request))
#8 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/CountUsers.php(18): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#9 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\CountUsers->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#10 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/Localize.php(19): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#11 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\Localize->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#12 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/Authorize.php(25): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#13 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\Authorize->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#14 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/AddToasts.php(22): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#15 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\AddToasts->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#16 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/AuthGuard.php(14): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#17 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\AuthGuard->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#18 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CP/ContactOutpost.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#19 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CP\\ContactOutpost->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#20 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#21 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Routing\\Middleware\\SubstituteBindings->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#22 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(78): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#23 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Foundation\\Http\\Middleware\\VerifyCsrfToken->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#24 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#25 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\View\\Middleware\\ShareErrorsFromSession->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#26 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#27 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\\Session\\Middleware\\StartSession->handleStatefulRequest(Object(Illuminate\\Http\\Request), Object(Illuminate\\Session\\Store), Object(Closure))
#28 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Session\\Middleware\\StartSession->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#29 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#30 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Cookie\\Middleware\\AddQueuedCookiesToResponse->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#31 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(67): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#32 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Cookie\\Middleware\\EncryptCookies->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#33 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/SwapExceptionHandler.php(19): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#34 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\SwapExceptionHandler->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#35 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(103): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#36 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Router.php(697): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#37 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Router.php(672): Illuminate\\Routing\\Router->runRouteWithinStack(Object(Illuminate\\Routing\\Route), Object(Illuminate\\Http\\Request))
#38 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Router.php(636): Illuminate\\Routing\\Router->runRoute(Object(Illuminate\\Http\\Request), Object(Illuminate\\Routing\\Route))
#39 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Routing/Router.php(625): Illuminate\\Routing\\Router->dispatchToRoute(Object(Illuminate\\Http\\Request))
#40 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(167): Illuminate\\Routing\\Router->dispatch(Object(Illuminate\\Http\\Request))
#41 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(128): Illuminate\\Foundation\\Http\\Kernel->Illuminate\\Foundation\\Http\\{closure}(Object(Illuminate\\Http\\Request))
#42 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/DisableFloc.php(18): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#43 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\DisableFloc->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#44 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CheckMultisite.php(14): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#45 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CheckMultisite->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#46 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/CheckComposerJsonScripts.php(14): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#47 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\CheckComposerJsonScripts->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#48 /Users/daniel/Code/cms/vendor/statamic/cms/src/Http/Middleware/PoweredByHeader.php(19): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#49 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Statamic\\Http\\Middleware\\PoweredByHeader->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#50 /Users/daniel/Code/cms/vendor/barryvdh/laravel-debugbar/src/Middleware/InjectDebugbar.php(67): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#51 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Barryvdh\\Debugbar\\Middleware\\InjectDebugbar->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#52 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#53 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ConvertEmptyStringsToNull.php(31): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#54 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Foundation\\Http\\Middleware\\ConvertEmptyStringsToNull->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#55 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#56 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/TrimStrings.php(40): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#57 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Foundation\\Http\\Middleware\\TrimStrings->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#58 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#59 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#60 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/PreventRequestsDuringMaintenance.php(86): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#61 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(167): Illuminate\\Foundation\\Http\\Middleware\\PreventRequestsDuringMaintenance->handle(Object(Illuminate\\Http\\Request), Object(Closure))
#62 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(103): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))
#63 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(142): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))
#64 /Users/daniel/Code/cms/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(111): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))
#65 /Users/daniel/Code/cms/public/index.php(59): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))
#66 /Users/daniel/Code/cms/server.php(21): require_once('/Users/daniel/C...')
#67 {main}
"}