Update document.py

[vvmruder]

Fix broken interface. If the URL is None we won't need a multilingual dict like {"de": None} but a real None. This PR is solving the issue

This is a followup of #1763 which break the tests 😬

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (031fedf) 77.73% compared to head (567c77c) 77.68%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
.../contrib/data_sources/oereblex/sources/document.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1864      +/-   ##
==========================================
- Coverage   77.73%   77.68%   -0.05%     
==========================================
  Files         127      127              
  Lines        5268     5271       +3     
==========================================
  Hits         4095     4095              
- Misses       1173     1176       +3     

Flag	Coverage Δ
unittests	77.68% <0.00%> (-0.05%)	⬇️

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[svamaa]

Looks good to me. As soon as the tests are done for the oereblex data_sources the issues from codecov can be addressed.

[vvmruder]

Looks good to me. As soon as the tests are done for the oereblex data_sources the issues from codecov can be addressed.

I did the additional test which was necessary 😆

[voisardf]

Looks good to me.