Fix functions without outputs

[andrzejressel]

Closes #564

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.52%. Comparing base (5888205) to head (aecc986).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   80.92%   82.52%   +1.60%     
==========================================
  Files          31       31              
  Lines        3554     3554              
==========================================
+ Hits         2876     2933      +57     
+ Misses        678      621      -57     

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