Fixed ConstantExpressionHelper.cs (#167)

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #168 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #168      +/-   ##
=========================================
+ Coverage   82.38%   82.4%   +0.02%     
=========================================
  Files          37      37              
  Lines        3627    3632       +5     
  Branches      488     489       +1     
=========================================
+ Hits         2988    2993       +5     
  Misses        501     501              
  Partials      138     138

Impacted Files	Coverage Δ
...nq.Dynamic.Core/Parser/ConstantExpressionHelper.cs	100% <100%> (ø)	⬆️

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