Merge pull request #4218 from owncloud/newdata

Fix potential undefined variable in Scanner

lib/files/cache/scanner.php

@@ -108,10 +108,10 @@ class Scanner extends BasicEmitter {
 					// Only update metadata that has changed
 					$newData = array_diff($data, $cacheData);
 				}
-			}
 				if (!empty($newData)) {
 					$this->cache->put($file, $newData);
 				}
+			}
 			return $data;
 		}
 		return null;