Fix for NSFE when mvn test run from /diktat-rules: follow up

[nulls]

fixed error message

[codecov]

Codecov Report

Merging #1367 (e140ec8) into master (fc84620) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1367   +/-   ##
=========================================
  Coverage     83.56%   83.56%           
  Complexity     2572     2572           
=========================================
  Files           106      106           
  Lines          7507     7507           
  Branches       2076     2076           
=========================================
  Hits           6273     6273           
  Misses          357      357           
  Partials        877      877           

Flag	Coverage Δ
unittests	83.56% <ø> (ø)

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