Fix unit test on classification selection

Codecov Report

Merging #559 into master will decrease coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #559      +/-   ##
==========================================
- Coverage   84.87%   84.86%   -0.02%     
==========================================
  Files         209      209              
  Lines       12539    12525      -14     
==========================================
- Hits        10643    10629      -14     
  Misses       1896     1896

Impacted Files	Coverage Δ
arkindex/documents/tests/test_moderation.py	100% <100%> (ø)

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merged

mentioned in commit c38a3f49