Fix (hack?) so that the JSON schema/swagger spec does not contain oneOf null types for optional fields.

[lukas-phaf]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (08b5445) 93.90% compared to head (eefe8cf) 93.77%.
Report is 4 commits behind head on master.

Files	Patch %	Lines
src/covjson_pydantic/base_models.py	88.88%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   93.90%   93.77%   -0.14%     
==========================================
  Files           9        9              
  Lines         279      289      +10     
==========================================
+ Hits          262      271       +9     
- Misses         17       18       +1     

Flag	Coverage Δ
unittests	93.77% <98.33%> (-0.14%)	⬇️

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