fix: whitespace rejected in comma separated rule lists (#1013)

[jshwi]

Closes #1013

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0158f20) to head (1f7936a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1014   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           30        30           
  Lines         5397      5407   +10     
=========================================
+ Hits          5397      5407   +10     

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