fix(eslint-plugin): [prefer-nullish-coalescing] handle case when type of left side is null or undefined

[auvred]

PR Checklist

• Addresses an existing open issue: fixes Bug: [prefer-nullish-coalescing] internal error when linting on binary expression (||) with nullable type #7222
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

The edge case: the type of left side can be explicitly null or undefined. Then there will be no types property and type can't be treated as ts.UnionOrIntersectionType

[typescript-eslint]

Thanks for the PR, @auvred!

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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✅ Successfully ran 31 targets

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• Node 20 - nx test scope-manager
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• nx run-many --target=typecheck --parallel
• nx run-many --target=lint --parallel
• Node 20 - nx test parser
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• Node 16 - nx run types:build
• nx run types:build
• Node 20 - nx test ast-spec
• Node 20 - nx test eslint-plugin-internal
• Node 16 - nx test utils --coverage=false
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• Node 20 - nx test eslint-plugin-tslint
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[codecov]

Codecov Report

Merging #7225 (841d45f) into main (e08a722) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7225   +/-   ##
=======================================
  Coverage   87.54%   87.55%           
=======================================
  Files         377      377           
  Lines       13172    13173    +1     
  Branches     3892     3893    +1     
=======================================
+ Hits        11532    11533    +1     
  Misses       1261     1261           
  Partials      379      379           

Flag	Coverage Δ
unittest	87.55% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...lint-plugin/src/rules/prefer-nullish-coalescing.ts	99.23% <100.00%> (+<0.01%)	⬆️

[JoshuaKGoldberg]

Yup looks great to me - nice little spot fix. Thanks @auvred! 🙌