[BUGFIX] Fix xml file handling for edit mode

Classes/Service/FileBaseService.php

@@ -114,7 +114,7 @@ abstract class FileBaseService extends FileService {
 
 			// get localized file
 			$lFile = $this->getLocalizedFile($localLang[$lang], $lang);
-			if ($this->checkLocalizedFile(basename($lFile), $lang)) {
+			if ($lFile && $this->checkLocalizedFile(basename($lFile), $lang)) {
 				$originLang[$lang] = $lFile;
 				$localLang[$lang] = array();