Add default parameter geom_blank to stat

[has2k1]

This allows us to extend stats with less boilerplate code. i.e. DEFAULT_PARAMS becomes optional.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.83%. Comparing base (bbf7fe3) to head (e7a73fa).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1040   +/-   ##
=======================================
  Coverage   86.83%   86.83%           
=======================================
  Files         203      203           
  Lines       13806    13806           
  Branches     1702     1702           
=======================================
  Hits        11988    11988           
  Misses       1273     1273           
  Partials      545      545           

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