Problem

parseAriaTemplate('') throws an error:

Error: Aria snapshot must be a YAML sequence, elements starting with " -"

An empty string is a valid aria tree representation (e.g. when all content is aria-hidden="true"), so parseAriaTemplate should return an empty fragment node instead of throwing.

Context

This blocks the fix for vitest#10158 (toMatchAriaInlineSnapshot('') cannot match empty aria trees). The vitest-side fix (vitest-dev/vitest#10188) correctly distinguishes "" from undefined, but when the empty string reaches parseAriaTemplate, it throws.

Expected behavior

parseAriaTemplate('') should return { kind: 'role', role: 'fragment' } — an empty fragment with no children.