fix: do not crash on empty pseudo arguments

[bartveneman]

Applies this fix bramus/specificity#30 while waiting on a release

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 77.32kB (27.87%) ⬆️⚠️, exceeding the configured threshold of 5%.

Bundle name	Size	Change
analyzeCss-esm	107.43kB	77.32kB (256.81%) ⬆️⚠️

Affected Assets, Files, and Routes:

view changes for bundle: analyzeCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
css-*.js	77.32kB	107.43kB	256.81% ⚠️

Files in css-*.js:

• ./src/index.js → Total Size: 30.07kB

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (1e25066) to head (e1617d3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #464   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          18       18           
  Lines        2263     2263           
=======================================
  Hits         2260     2260           
  Misses          3        3           

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