[Bug 1945368]

[Richard Leger]

Both the following shall fix the issue a priori:

Bug 1729664 Comment 13
and
Bug 1727938 Comment 16

But it is hard to tell as the local home calendar empty issue upon upgrade is very hard to reproduce at will.
Only an affected user waiting for available update could confirm.

Also it remain unclear why the following error appeared in the first
place nor if any of the patch would fix the issue other than a
workaround/band-aid...

````jy
TypeError: item.id is null (24 times)
CalStorageCalendar.jsm:2252:9
````

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

Title:
  Thunderbird 91 forgets default calendar

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