FIX: Improve robustness of field summary dictionary to DataFrame conversion

[lorenzovecchietti]

With empty cells the conversion to float was failing, now a pd.nan entry will be used in those cases.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.09%. Comparing base (761344a) to head (a8c48cd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5986      +/-   ##
==========================================
- Coverage   85.10%   85.09%   -0.01%     
==========================================
  Files         165      165              
  Lines       62807    62807              
==========================================
- Hits        53449    53443       -6     
- Misses       9358     9364       +6     

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