Summary:
We have to do some garbage nonsense to write database backups right now, see T6996.
When storage isn't initialized, we previously ended up with this message gzipped in a file and an empty error. Make the behavior slightly more tolerable.
Test Plan: Saw a meaningful error after trying to back up an uninitialized database.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11449