catch any exception for transaction control

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>

Author: blizzz

apps/dav/lib/DAV/CustomPropertiesBackend.php

@@ -24,7 +24,7 @@
  */
 namespace OCA\DAV\DAV;
 
-use OCP\DB\Exception;
+use Exception;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
 use OCP\IUser;