Remove warning for single image in subdir

[user27182]

Remove unnecessary warning, see #198 (comment)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.75%. Comparing base (f1fe00c) to head (02eba32).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   96.79%   96.75%   -0.04%     
==========================================
  Files           4        4              
  Lines         873      864       -9     
  Branches      116      114       -2     
==========================================
- Hits          845      836       -9     
  Misses         20       20              
  Partials        8        8              

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