T-38: fixed NPE in comparator

[whiskels]

resolves #217

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.07%. Comparing base (9470f28) to head (545e202).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #218   +/-   ##
=========================================
  Coverage     91.07%   91.07%           
  Complexity      266      266           
=========================================
  Files            61       61           
  Lines           717      717           
  Branches         34       34           
=========================================
  Hits            653      653           
  Misses           50       50           
  Partials         14       14           

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