[Bugfix] No empty style class attribute

[titouanmathis]

🔗 Linked issue

No issue.

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Prevent rendering empty style="" or class="" attributes.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.
• I have updated the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0a1eb65) to head (bdb96e7).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff               @@
##             develop       #38      +/-   ##
==============================================
+ Coverage      97.75%   100.00%   +2.24%     
- Complexity        58        61       +3     
==============================================
  Files              6         6              
  Lines            178       181       +3     
==============================================
+ Hits             174       181       +7     
+ Misses             4         0       -4     

Flag	Coverage Δ
unittests	100.00% <100.00%> (+2.24%)	⬆️

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