Dont return cached date in shared cache when the file doesn't exist

apps/files_sharing/lib/cache.php

@@ -89,6 +89,7 @@ class Shared_Cache extends Cache {
 			$cache = $this->getSourceCache($file);
 			if ($cache) {
 				$data = $cache->get($this->files[$file]);
+				if ($data) {
 					$data['displayname_owner'] = \OC_User::getDisplayName($this->storage->getSharedFrom());
 					$data['path'] = $file;
 					if ($file === '') {
@@ -100,6 +101,7 @@ class Shared_Cache extends Cache {
 					} else {
 						$data['permissions'] = $this->storage->getPermissions($file);
 					}
+				}
 				return $data;
 			}
 		} else {