Correct error reporting for invalid CComplexObjectProxy nodes.

[wolandscat]

This is a straight coding error that incorrectly reports errors with use_node validation.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.94%. Comparing base (8df5c64) to head (07831b3).

Files	Patch %	Lines
...etypevalidator/validations/FlatFormValidation.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #623   +/-   ##
=========================================
  Coverage     71.94%   71.94%           
  Complexity     7066     7066           
=========================================
  Files           671      671           
  Lines         23034    23034           
  Branches       3740     3740           
=========================================
  Hits          16572    16572           
  Misses         4717     4717           
  Partials       1745     1745           

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