Do not write empty `init.yml`
Do not write empty `init.yml`

If the `init.yml` is empty, we should probably be looking in manually managed data. DMOJ/judge-server#670 will not remove the folder from the cache if it sees an `init.yml`, even an empty one, so we delete it instead.
DMOJ/site,DMOJ/site,DMOJ/site,DMOJ/site