support for omitempty in tag

[shamaton]

• Support for omit empty in tag #46

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.43%. Comparing base (d00aa7a) to head (8f7768e).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   98.41%   98.43%   +0.01%     
==========================================
  Files          71       71              
  Lines        6617     6696      +79     
==========================================
+ Hits         6512     6591      +79     
  Misses         82       82              
  Partials       23       23              

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