When we click on 'Remove unused references' option on a library which have not package installed is giving object reference not set to an instance of an object error. It can give some user-friendly error

[sumesh92]

Versions

• GitHub Extension for Visual Studio version: ...
• Visual Studio version: ...

What happened

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Screenshots

Logs

Additional context

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