fix(eslint-plugin): [comma-dangle] fixed crash from undefined predicate.ignore

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Bug: [@typescript-eslint/comma-dangle] ruleListener is not a function error when using generics: ignore setting #7220
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Reverts ignore from undefined back to () => {}, and adds a test case for the crash.

Shoutout+thanks to @erik-slovak for reporting in 42fe29f#r121427176 & @sharpdressedcodes for pointing out the lack of unit test! 🙌

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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• Node 16 - nx test eslint-plugin --coverage=false
• Node 20 - nx test eslint-plugin
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• Node 16 - nx test rule-schema-to-typescript-types --coverage=false
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint

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[sharpdressedcodes]

Thank you!