fix: resolve.extensions.length=0 is error, fix #4174

[jeff-fe]

when resolve.extensions.length=0, DEFAULT_EXTENSIONS is not use

Description

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[Shinigami92]

@patak-js Do we want a test case for this?

[patak-dev]

If options.extensions is an empty array, no extensions should be resolved. Vite current behaviour is correct here. Pass undefined if you want to use the defaults

[jeff-fe]

If options.extensions is an empty array, no extensions should be resolved. Vite current behaviour is correct here. Pass undefined if you want to use the defaults

hi @patak-js when options.extensions is an empty array, project page load error , @vite/client is 404 not found. please help to solve this problem. thanks.

[patak-dev]

@ygj6 is already looking into this one #4174 (comment)