fix(server): accept empty bytes data in Audio like Image

[KaiyiQuan]

Summary

Audio(data=b"") raises ValueError("Either path or data can be provided") while Image(data=b"") works. Audio.__init__ validated with not bool(path) ^ bool(data), so a falsy-but-present empty bytes payload was treated as missing.

Change

Align Audio's validation with Image's: raise only when both path is None and data is None (or both provided). Same messages as Image (Either path or data must be provided / Only one of path or data can be provided).

Verification

New tests tests/server/mcpserver/utilities/test_media_types.py: Audio(data=b""), non-empty data, path-only, and the two error paths (6 passed).

Fixes #3656

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[github-actions]

This PR has been closed automatically. This repo only keeps pull requests open when they come from a maintainer, or from a contributor a maintainer has assigned to the linked issue, and you aren't currently assigned to #3656.

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Maintainers: reopen, remove missing-issue-link, or add bypass-issue-check to override.