handle FileNotFoundError when determining ACState

[nestingBiscuit]

• Added error handling for systems that do not provide /sys/class/power_supply. Such as Synology devices.
• Fixes #877

[samschott]

Thanks! Could you also add a note in CHANGELOG.md for the fix?

[nestingBiscuit]

Ah, right of course. I did not think of that.

[codecov[bot]]

Codecov Report

Merging #880 (7b7aa13) into main (73d782f) will decrease coverage by 0.05%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #880      +/-   ##
==========================================
- Coverage   78.66%   78.62%   -0.05%     
==========================================
  Files          42       42              
  Lines        7501     7504       +3     
==========================================
- Hits         5901     5900       -1     
- Misses       1600     1604       +4     

Flag	Coverage Δ
pytest	78.62% <50.00%> (-0.05%)	:arrow_down:

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Impacted Files	Coverage Δ
src/maestral/utils/integration.py	69.23% <50.00%> (-0.95%)	:arrow_down:

... and 1 file with indirect coverage changes

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