Update lib/FilesHooks.php

Co-authored-by: Louis <louis@chmn.me>
Signed-off-by: Messj1 <jan@mtec-studios.ch>

Author: Messj1

lib/FilesHooks.php

@@ -396,10 +396,7 @@ protected function fileMoving($oldPath, $newPath) {
 		}
 		$accessList = $this->getUserPathsFromPath($parentPath, $parentOwner);
 		$affectedUsers = $accessList['users'];
-		$oldUsers = [];
-		if (isset($this->oldAccessList['users'])) {
-			$oldUsers = $this->oldAccessList['users'];
-		}
+		$oldUsers = $this->oldAccessList['users'] ?? [];
 
 		// file can be shared using GroupFolders, including ACL check
 		if ($this->config->getSystemValueBool('activity_use_cached_mountpoints', false)) {