owncloud/core — pull request #11992 by PVince81 (2014-11-06 10:11:30+00:00)
Title: Convert StorageNotAvailableException to SabreDAV exception

Convert \OCP\Files\StorageNotAvailableException to
\Sabre\DAV\Exception\ServiceUnavailable for every file/directory
operation happening inside of SabreDAV.

This is necessary to avoid having the exception bubble up to remote.php
which would return an exception page instead of an appropriate response.