PowerShell: Formatter throws an exception on $null

[jt4545x]

Describe the bug

If a PowerShell script or command has an output of $null, the formatter will throw this exception:

NullReferenceException: Object reference not set to an instance of an object. Error: Command failed: SubmitCode: $null

Please complete the following:

Which version of .NET Interactive are you using? (In a notebook, run the #!about magic command. ): BuildInfo AssemblyVersion: 1.0.0.0 BuildDate: 2025-07-01T22:20:37.6002647Z AssemblyInformationalVersion: 1.0.632301+7d35ce3be7eb7a603527a3683b691d5e9922adca AssemblyName: Microsoft.DotNet.Interactive.App

• OS
  • [x ] Windows 11
  • [ ] Windows 10
  • [ ] macOS
  • [ ] Linux (Please specify distro)
  • [ ] iOS
  • [ ] Android
• Frontend
  • [ ] Jupyter Notebook
  • [ ] Jupyter Lab
  • [ ] nteract
  • [x ] Visual Studio Code
  • [ ] Visual Studio Code Insiders
  • [ ] Visual Studio
  • [ ] Other (please specify)