fix(storybook): optional chain .length in utils

[mandarini]

Current Behavior

Cannot read properties of undefined (reading 'length')

Expected Behavior

Should just skip if array is undefined.

Related Issue(s)

Fixes #17966

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 7, 2023 7:58am

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