drop unneeded code
don't typecast null values inside dispatcher.php
Add StorageNotAvailableException
Handle StorageNotAvailableException in ajax/list.php
If loading a directory fails, navigate back to the previous directory
Handle StorageNotAvailableException in webdav
Fix migrator tests to use the correct migrator instances
Added test for reserved keywords
hides table header while users load.
Add bak defaultapp setting
Detect removed public shares
Remove external shares if the share is invalid
More error catching in list.php
Catch StorageInvalidException in webdav
Support for multiple default apps

If a default app isn't visible for the user, try the next one.
Else fallback to the "files" app.
Merge pull request #9330 from owncloud/jumpingheader

Hides table header while users load in User Management
Use getAbsoluteUrl for redirection URL

Also separate the function into getDefaultPageUrl() and
redirectToDefaultPage() to make it testable.
fix the layout of the enforced expiry date message
increase width of version dropdown - fixes #9270
Redirect after session expiry to the previous loaded page

* fixes #6945