Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

fix vuejs/language-tools#5956

Align with
https://github.com/vuejs/language-tools/blob/3fb3329dfb959ad84fb3a692acbcf0a6684fa410/extensions/vscode/src/extension.ts#L223.

Release Notes:

- Always pass null when body is non-existent in Vue language server
request

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Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>