Revert "FIX for webdav.mediencenter.t-online.de"

lib/private/files/storage/dav.php

@@ -602,11 +602,6 @@ class DAV extends \OC\Files\Storage\Common {
 					return false;
 				}
 			} else {
-				// This resolves issues that are flooding the log file due to some malformed
-				// WebDAV response e.g. T-Mobile's cloud named "Mediencenter"
-				if (!isset($response['{DAV:}getlastmodified']))
-					return false;
-				
 				$remoteMtime = strtotime($response['{DAV:}getlastmodified']);
 				return $remoteMtime > $time;
 			}