unset x-amz-tagging-count when object tagging is empty.

[Robothy]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (5aa11f6) to head (117c61a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #96   +/-   ##
=========================================
  Coverage     89.51%   89.52%           
- Complexity     1045     1047    +2     
=========================================
  Files           195      195           
  Lines          3644     3647    +3     
  Branches        209      211    +2     
=========================================
+ Hits           3262     3265    +3     
  Misses          279      279           
  Partials        103      103           

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