[#1804] Fix missing category 500

[pi-sigma]

Taiga #1804

[codecov-commenter]

Codecov Report

Merging #811 (00a1688) into develop (5a60c3e) will decrease coverage by 0.01%.
Report is 2 commits behind head on develop.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #811      +/-   ##
===========================================
- Coverage    93.05%   93.04%   -0.01%     
===========================================
  Files          742      742              
  Lines        25821    25830       +9     
===========================================
+ Hits         24028    24034       +6     
- Misses        1793     1796       +3     

Files	Coverage Δ
src/open_inwoner/pdc/tests/test_views.py	100.00% <100.00%> (ø)
src/open_inwoner/pdc/views.py	85.19% <100.00%> (+0.05%)	⬆️

... and 1 file with indirect coverage changes

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[alextreme]

Thanks!