Do not send notification on VersionLockedError
Do not send notification on VersionLockedError

Instead of LockTimeout exception we are raising VersionLockedError
instead. This change introduced a bug that notification started being
sent again when a Version was locked and this was really annoying.

rtfd/readthedocs.org,rtfd/readthedocs.org,rtfd/readthedocs.org,rtfd/readthedocs.org