Fix inconsistent null handling in DataFrame Arithmetics

[asmirnov82]

Fixes #5650

[codecov]

Codecov Report

Merging #6770 (99bbe5d) into main (39235a7) will decrease coverage by 0.06%.
The diff coverage is 50.82%.

@@            Coverage Diff             @@
##             main    #6770      +/-   ##
==========================================
- Coverage   69.03%   68.97%   -0.06%     
==========================================
  Files        1237     1237              
  Lines      252700   253459     +759     
  Branches    26446    26536      +90     
==========================================
+ Hits       174449   174825     +376     
- Misses      71308    71683     +375     
- Partials     6943     6951       +8     

Flag	Coverage Δ
Debug	68.97% <50.82%> (-0.06%)	⬇️
production	63.54% <48.39%> (-0.07%)	⬇️
test	88.84% <100.00%> (+<0.01%)	⬆️

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Files Changed	Coverage
...ata.Analysis/PrimitiveDataFrameColumnArithmetic.cs	48.27%
...t.Data.Analysis/PrimitiveColumnContainerHelpers.cs	100.00%
...st/Microsoft.Data.Analysis.Tests/DataFrameTests.cs	100.00%

[asmirnov82]

Hello @JakeRadMSFT ,
conflict that prevented this PR from being merged into dev is solved now. Could you please perform a merge?

[michaelgsharp]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).