Fix: don't throw if a single dat/input/patch directory is empty

[emmercm]

Fixes: #1199

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.22%. Comparing base (afb6449) to head (002197f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1231      +/-   ##
==========================================
+ Coverage   93.17%   93.22%   +0.05%     
==========================================
  Files         108      108              
  Lines        6711     6706       -5     
  Branches     1480     1584     +104     
==========================================
- Hits         6253     6252       -1     
+ Misses        457      430      -27     
- Partials        1       24      +23     

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[github-actions]

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