The upload omitted folder_id, which the handler needs to resolve the
file's owner — it answers 500, not a root upload. Every other upload in
the suite passes it; this was the only one that did not, which is why
nothing caught it earlier.
The folder also gives the WebDAV overwrite a deterministic path
(/webdav/hurl-etag-src/<name>) instead of depending on where a
folder-less upload would have landed. Teardown now removes it and
purges it from trash, keeping the shared database clean for the files
that run after.
Edouard Vanbelle
19a8186c66