Cannot view installed packages in Package Manager when a tarball package is removed from the project folder

 Repro Steps

1. Open the “GoudaTour.zip“ package
2. Open the Package Manager
3. Observe the Package Manager

Expected results

Package Manager functions as usual

Actual results

Package Manager fails to function and throws “[Package Manager Window] Error fetching package list“ errors in the Console window

Environemnt

• Reproducible in: 2021.3.34f1, 2022.3.19f1, 2023.2.8f1, 2023.3.0b5
• Reproduced on: Windows 11 Pro
• Not reproduced on: No other environment tested