Handle family move error

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 78.94%. Comparing base (4777dfc) to head (5fa8853). Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
src/maestral/errorhandling.py	16.66%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1068 +/- ## ========================================== - Coverage 78.99% 78.94% -0.05% ========================================== Files 42 42 Lines 7550 7556 +6 ========================================== + Hits 5964 5965 +1 - Misses 1586 1591 +5 ``` | [Flag](https://app.codecov.io/gh/samschott/maestral/pull/1068/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SamSchott) | Coverage Δ | | |---|---|---| | [pytest](https://app.codecov.io/gh/samschott/maestral/pull/1068/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SamSchott) | `78.94% <16.66%> (-0.05%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SamSchott#carryforward-flags-in-the-pull-request-comment) to find out more.

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