Title: MusicBrainz Picard fails to launch on macOS — “Expected an instance of Tagger”

Hello,

I’m having an issue launching MusicBrainz Picard on macOS. I was using alpha and b1 before, all working fine

When I open the app normally, the dock icon bounces briefly and then the application never opens.

I tried launching it from Terminal using:

/Applications/MusicBrainz\ Picard.app/Contents/MacOS/picard-plugins

and I consistently get this traceback:

Traceback (most recent call last):
File "cli.py", line 2280, in <module>
File "cli.py", line 2247, in main
File "cli.py", line 2233, in minimal_init
File "picard/webservice/_init.py", line 371, in __init_
File "picard/_init_.py", line 80, in tagger_instance
AssertionError: Expected an instance of Tagger

[PYI-39364:ERROR] Failed to execute script 'cli' due to unhandled exception: Expected an instance of Tagger

The app does not open at all after the error appears.

Note, the apps launches if I run /Applications/MusicBrainz\ Picard.app/Contents/MacOS/picard-run, altrough without plugin support