Fix regression when Field's childen might be nullish

[MrFlashAccount]

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• Tests are added (including unit tests and stories in the storybook)
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Closes: N/A

Other information

[changeset-bot]

🦋 Changeset detected

Latest commit: 2b46a3d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cube-dev/ui-kit	Patch

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[github-actions]

🏗 Docs are successfully deployed!

👀 Preview: https://6442f0c23efefb1aabaffcfe--cube-uikit-storybook.netlify.app

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🧪 Storybook is successfully deployed!

• 👀 Review changes: https://www.chromatic.com/build?appId=626ee6db91d1c8004a912249&number=883
• 👨‍🎨 Preview storybook: https://626ee6db91d1c8004a912249-swezekuwkq.chromatic.com/

[github-actions]

📦 NPM canary release

Deployed canary version 0.0.0-canary-b7ff430.

[github-actions]

🏋️ Size limit report

Name	Size	Passed?
All	149.35 KB (+0.01% 🔺)	Yes 🎉
Tree shaking (just a Button)	26.37 KB (0% 🟰)	Yes 🎉

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