fix: do not crash on weird font-family

[bartveneman]

closes #453

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 228 bytes (0.08%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
analyzeCss-esm	29.23kB	228 bytes (0.79%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: analyzeCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
css-*.js	228 bytes	29.23kB	0.79%

Files in css-*.js:

• ./src/values/destructure-font-shorthand.js → Total Size: 3.29kB

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (5bba11d) to head (297e437).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #454   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          18       18           
  Lines        2228     2230    +2     
=======================================
+ Hits         2225     2227    +2     
  Misses          3        3           

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