[Tags] Possible to have a note with not existing / empty tag

### Expected
There should be no empty tags.
There should be no cases when app has no tags, but tag is displayed in a note

### Observed
When note having a tag is restored from trash, it will contain a tag, no matter if this tag is present in the app or not.

### Reproduced
1. Create a new note with any text
2. Place a new tag inside the note
3. Trash this note
4. Delete the new tag from tags drawer
5. Restore the note from trash ~> it will have the tag, however the tags drawer will be empty.

This tag in electron will look as an empty tag:

Make|Model|macOS Version|App Version
-|-|-|-
Mac|MBP 15"|10.15.7|2.6

No file or test is named. First reproduce the restore-from-trash flow with a note containing a tag, then inspect the note and tag restoration path; done means restoring a note after its tag is deleted does not leave an empty or nonexistent tag attached while the tags drawer is empty.

Written by the indexing model from the issue text.