Used TryGetField in FieldSelectionMapValidator

[glen-84]

Summary of the changes (Less than 80 chars)

• Used TryGetField in FieldSelectionMapValidator.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.85%. Comparing base (f7aa371) to head (0bf188d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8067   +/-   ##
=======================================
  Coverage   73.85%   73.85%           
=======================================
  Files        2645     2645           
  Lines      138630   138630           
  Branches    16056    16056           
=======================================
+ Hits       102381   102387    +6     
+ Misses      30786    30781    -5     
+ Partials     5463     5462    -1     

Flag	Coverage Δ
unittests	73.85% <ø> (+<0.01%)	⬆️

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