Improve dm-thin behavior of empty blocks

[Schamper]

Fixes #31

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.42%. Comparing base (70006bc) to head (10afcd7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   72.38%   72.42%   +0.04%     
==========================================
  Files          26       26              
  Lines        1959     1962       +3     
==========================================
+ Hits         1418     1421       +3     
  Misses        541      541              

Flag	Coverage Δ
unittests	72.42% <100.00%> (+0.04%)	⬆️

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