[Bug 1945368]

[Richard Leger]

Wayne please re-read comment 67, this bug is clearly about local home
calendar being empty following upgrade due to:

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

add-on issue was a separate one that was early repored fixed via
remove/re-add the add-on.

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

Title:
  Thunderbird 91 forgets default calendar

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