add test case for empty domain tag

[ryanio]

Adds test case for #222

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b51f27e) 93.13% compared to head (09959ac) 93.13%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #232   +/-   ##
=======================================
  Coverage   93.13%   93.13%           
=======================================
  Files          16       16           
  Lines        3786     3788    +2     
  Branches      334      334           
=======================================
+ Hits         3526     3528    +2     
  Misses        250      250           
  Partials       10       10           

Impacted Files	Coverage Δ
src/utils/usecase.ts	89.51% <100.00%> (+0.17%)	⬆️

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