Raising an error when section_title_styles are used with write_html() - cf. #1080

[Lucas-C]

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[codecov-commenter]

Codecov Report

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

Comparison is base (f2496a7) 93.50% compared to head (faa0e8c) 93.49%.

❗ Current head faa0e8c differs from pull request most recent head 6b6ebe8. Consider uploading reports for the commit 6b6ebe8 to get more accurate results

Files	Patch %	Lines
fpdf/fpdf.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1083      +/-   ##
==========================================
- Coverage   93.50%   93.49%   -0.01%     
==========================================
  Files          29       29              
  Lines        8550     8553       +3     
  Branches     1575     1577       +2     
==========================================
+ Hits         7995     7997       +2     
  Misses        344      344              
- Partials      211      212       +1     

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