fix: do not crash on var(--font-stack, family1, family2, etc)

[bartveneman]

No description provided.

[codecov-commenter]

Bundle Report

Changes will decrease total bundle size by 12 bytes (-0.01%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
analyzeCss-analyzeCss-esm	99.63kB	-12 bytes (-0.01%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: analyzeCss-analyzeCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
analyze-*.js	-12 bytes	99.63kB	-0.01%

Files in analyze-*.js:

• ./src/index.js → Total Size: 29.47kB

• ./src/values/destructure-font-shorthand.js → Total Size: 3.1kB

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (b148fac) to head (2fcb5fc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #436   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          18       18           
  Lines        2239     2246    +7     
=======================================
+ Hits         2236     2243    +7     
  Misses          3        3           

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