[Bug 1945368]

[Vseerror]

Certainly the blank calendar needs a solution if it is not yet resolved.
I leave it to Richard and Anje to decide whether the bug continues and
how to most efficiently proceed - whether this bug report should be
reopened, or deserves a new new bug report.

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https://bugs.launchpad.net/bugs/1945368

Title:
  Thunderbird 91 forgets default calendar

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