Crashes when selecting non-existing window

[akomic]

/window 100

panic: runtime error: index out of range

goroutine 1 [running]: github.com/mephux/komanda-cli/komanda/command.(*WindowCmd).Exec.func1(0xc4200e6480, 0xc4200e63f0, 0xc4200e1860, 0xc4200836c0, 0x0, 0x1) /Users/ak/Stuff/go/src/github.com/mephux/komanda-cli/komanda/command/window.go:38 +0x3e9 github.com/mephux/komanda-cli/komanda/client.(*Server).Exec.func1(0xc4200e63f0, 0x1, 0xc420501b70) /Users/ak/Stuff/go/src/github.com/mephux/komanda-cli/komanda/client/server.go:72 +0x1be github.com/mephux/komanda-cli/vendor/github.com/jroimartin/gocui.(*Gui).MainLoop(0xc4200e63f0, 0x1370b55, 0x5) /Users/ak/Stuff/go/src/github.com/mephux/komanda-cli/vendor/github.com/jroimartin/gocui/gui.go:358 +0x1db github.com/mephux/komanda-cli/komanda.Run(0x0, 0x0, 0xc4200836c0) /Users/ak/Stuff/go/src/github.com/mephux/komanda-cli/komanda/gui.go:162 +0xb32 main.main() /Users/ak/Stuff/go/src/komanda-cli/komanda.go:153 +0x65d