GenerateConditional will cast to nullable valuetype if needed

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #222 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
+ Coverage   96.61%   96.63%   +0.01%     
==========================================
  Files          41       41              
  Lines        6623     6648      +25     
==========================================
+ Hits         6399     6424      +25     
  Misses        224      224

Impacted Files	Coverage Δ
...ystem.Linq.Dynamic.Core/Parser/ExpressionParser.cs	98.57% <100%> (+0.02%)	⬆️

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