The $Host.Runspace is null when PSConsoleHostReadLine is invoked while debugging a thread job.
This is because a thread job uses the default host, which always has value null for $Host.Runspace.
We set the current path to be null when either runspace or engineIntrinsics is null.
PR Checklist
PR has a meaningful title
Use the present tense and imperative mood when describing your changes
Summarized changes
Make sure you've added one or more new tests
Make sure you've tested these changes in terminals that PowerShell is commonly used in (i.e. conhost.exe, Windows Terminal, Visual Studio Code Integrated Terminal, etc.)
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PR Summary
Fix #3954
The $Host.Runspace is null when PSConsoleHostReadLine is invoked while debugging a thread job.
This is because a thread job uses the default host, which always has value null for $Host.Runspace.
We set the current path to be null when either runspace or engineIntrinsics is null.
PR Checklist
Microsoft Reviewers: Open in CodeFlow