fix(dav): catch NotFound exception in UploadHome::childExists() #57096
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Summary
The method never returns
falsefor non-existence - it either returnstrueor throws (passes on) an exception.This doesn't match the API contract for getChild().
The null check was meaningless since exceptions are thrown before null can be returned.
Discovered while implementing unit tests.
TODO
Checklist
3. to review, feature component)stable32)