fix getChild()

apps/dav/lib/CalDAV/CalDavBackend.php

@@ -415,7 +415,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 			$calendar[$xmlName] = $row[$dbName];
 		}
 
-		return array_values($calendar);
+		return $calendar;
 
 	}