Add StorageNotAvailableException
Handle StorageNotAvailableException in ajax/list.php
If loading a directory fails, navigate back to the previous directory
Handle StorageNotAvailableException in webdav
Detect removed public shares
Remove external shares if the share is invalid
More error catching in list.php
Catch StorageInvalidException in webdav
Fixed remote share password param detection
Fix unit test
Remove invalid mounts from the active fs
Merge pull request #9311 from owncloud/storage-not-available

Handle storages not being available in webui and webdav