Project creation fails without further explanation when a standalone installed version is deleted prior to project creation

Steps to reproduce:

1. Install a new version through a standalone installer (6000.5.0b1 for example)
2. Open Hub
3. Add the installed version through the "Locate" button in the Installs section
4. Delete the installed version externally
5. Close Unity Hub
6. Open Unity Hub
7. Try creating a project with the deleted version
8. Observe the Hub

Actual results: "Unable to create project" is displayed

Expected results: A more detailed explanation like "The <selected version> version is missing" or a similar error is displayed (or rather the version is removed from the Installs list upon opening Hub)

Reproducible with versions: 3.17.3, 3.18.0

Tested on (OS): Windows 11 Pro

Notes:

• No automatic validation for broken version references exists, therefore, the broken references remain attached to the Hub until removed manually
• Projects previously opened with the later removed version will not open, and no error or warning will be thrown