PRs don't show up if the source repository has been deleted

[Tyriar]

I'm trying to resolve the conflict for microsoft/vscode-wiki#196 but I cannot as it doesn't show up in the PR view. Trying to use a codespace makes it clear that the issue is the repo the PR was created from has already been deleted:

Output:

[Info] C:\Users\Daniel\.ssh\config: ENOENT: no such file or directory, open 'C:\Users\Daniel\.ssh\config'
[Info] Registering git provider
[Info] Looking for git repository
[Info] Found 1 repositories during activation
[Info] Git repository found, initializing review manager and pr tree view.
[Info] Review> Validate state in progress
[Info] Review> Validating state...
[Info] Cannot updates repositories as git is uninitialized
[Info] Review> Queuing additional validate state
[Info] Review> Validating state...
[Info] Cannot updates repositories as git is uninitialized
[Info] Git initialization state changed: state=initialized
[Info] Review> Queuing additional validate state
[Info] Review> no matching pull request metadata found for current branch main
[Info] Review> no matching pull request metadata found on GitHub for current branch main
[Info] Review> Validating state...
[Info] No remote with name 'ups' found.
[Info] Found GitHub remote
[Info] Review> no matching pull request metadata found for current branch main
[Info] Review> no matching pull request metadata found on GitHub for current branch main
[Info] GitHubRepository> The remote branch for this PR was already deleted.
[Info] GitHubRepository> The remote branch for this PR was already deleted.

[Tyriar]

It's arguable what should happen here, but I was pretty confused as no error was surfaced at the least. The PR should show up in the list, perhaps with a ⚠️ and custom hover or something?