Check if data variable in scanner isn't null before using it

lib/files/cache/scanner.php

@@ -70,6 +70,7 @@ class Scanner {
 	public function scanFile($file) {
 		\OC_Hook::emit('\OC\Files\Cache\Scanner', 'scan_file', array('path' => $file, 'storage' => $this->storageId));
 		$data = $this->getData($file);
+		if ($data) {
 			if ($file !== '') {
 				$parent = dirname($file);
 				if ($parent === '.') {
@@ -81,6 +82,7 @@ class Scanner {
 			}
 			$id = $this->cache->put($file, $data);
 			$this->permissionsCache->set($id, \OC_User::getUser(), $data['permissions']);
+		}
 		return $data;
 	}
 
@@ -101,6 +103,7 @@ class Scanner {
 				if ($file !== '.' and $file !== '..') {
 					$child = ($path !== '') ? $path . '/' . $file : $file;
 					$data = $this->scanFile($child);
+					if ($data) {
 						if ($data['mimetype'] === 'httpd/unix-directory') {
 							if ($recursive === self::SCAN_RECURSIVE) {
 								$data['size'] = $this->scan($child, self::SCAN_RECURSIVE);
@@ -115,6 +118,7 @@ class Scanner {
 						}
 					}
 				}
+			}
 			if ($size !== -1) {
 				$this->cache->put($path, array('size' => $size));
 			}