feat(Picker): add empty slot

[inottn]

close #13218

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.60%. Comparing base (10b72e8) to head (0616861).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13219   +/-   ##
=======================================
  Coverage   89.59%   89.60%           
=======================================
  Files         257      257           
  Lines        7006     7010    +4     
  Branches     1733     1734    +1     
=======================================
+ Hits         6277     6281    +4     
+ Misses        386      384    -2     
- Partials      343      345    +2     

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[chenjiahan]

LGTM 👍