Gracefully handle missing physical devices in LVM2

[Schamper]

Fixes #33

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.38%. Comparing base (3ba83d3) to head (8b773b3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   72.35%   72.38%   +0.02%     
==========================================
  Files          26       26              
  Lines        1957     1959       +2     
==========================================
+ Hits         1416     1418       +2     
  Misses        541      541              

Flag	Coverage Δ
unittests	72.38% <100.00%> (+0.02%)	⬆️

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