fix: change best fit formula if dataframe is empty

[Exzentttt]

No description provided.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (bb05187) 92.10% compared to head (127d784) 92.81%.
Report is 75 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #157      +/-   ##
==========================================
+ Coverage   92.10%   92.81%   +0.70%     
==========================================
  Files          18       18              
  Lines        1621     1934     +313     
==========================================
+ Hits         1493     1795     +302     
- Misses        128      139      +11     

Files	Coverage Δ
styleframe/__init__.py	100.00% <100.00%> (ø)
styleframe/utils.py	99.30% <100.00%> (+0.20%)	⬆️
styleframe/version.py	93.75% <100.00%> (ø)
styleframe/style_frame.py	90.28% <93.75%> (-0.65%)	⬇️
styleframe/styler.py	84.84% <70.83%> (+4.07%)	⬆️

... and 2 files with indirect coverage changes

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[DeepSpace2]

Thanks!