fix errors on empty columns

[calchoo]

Fix summary to bypass some errors when certain columns are empty

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (fb4b645) 86.94% compared to head (d7e7c01) 86.92%.

Additional details and impacted files

@@              Coverage Diff               @@
##           develop_v3     #354      +/-   ##
==============================================
- Coverage       86.94%   86.92%   -0.02%     
==============================================
  Files              57       57              
  Lines            9390     9392       +2     
  Branches         2355     2356       +1     
==============================================
  Hits             8164     8164              
- Misses            751      753       +2     
  Partials          475      475              

Flag	Coverage Δ
unittests	86.92% <0.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
src/mavis/summary/main.py	76.22% <0.00%> (-1.09%)	⬇️

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