Fix support of custom error handler in Django decorator

[mik-laj]

I worked on updating library in my project and I found one small problem

Related PR: https://github.com/KlubJagiellonski/pola-backend/pull/4230

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.57%. Comparing base (c9ba8eb) to head (8522c0a). Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #979      +/-   ##
==========================================
- Coverage   90.62%   90.57%   -0.06%     
==========================================
  Files         150      150              
  Lines        4374     4382       +8     
  Branches      532      534       +2     
==========================================
+ Hits         3964     3969       +5     
- Misses        318      320       +2     
- Partials       92       93       +1     

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