fixed bug with empty constructors

[kragol]

fixes #85

[bkamins]

Thank you for reporting. Could you please add tests for the changed methods?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.56%. Comparing base (1bb9c95) to head (fe23cfd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   87.97%   88.56%   +0.58%     
==========================================
  Files           1        1              
  Lines         341      341              
==========================================
+ Hits          300      302       +2     
+ Misses         41       39       -2     

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[kragol]

Tests added.

[bkamins]

I have added some more tests. Thank you for contributing.