Merge pull request #61258 from nextcloud/backport/61245/stable34

[stable34] fix: Fix PHP Warning foreach() argument must be of type array|object, null given

Author: AndyScherzinger

lib/private/Share20/ShareHelper.php

@@ -103,7 +103,7 @@ protected function getPathsForUsers(Node $node, array $users): array {
 			try {
 				$item = $item->getParent();
 
-				if ($byId[$item->getId()] !== []) {
+				if (isset($byId[$item->getId()]) && $byId[$item->getId()] !== []) {
 					foreach ($byId[$item->getId()] as $uid => $path) {
 						$results[$uid] = $path . $appendix;
 					}
@@ -160,7 +160,7 @@ protected function getPathsForRemotes(Node $node, array $remotes): array {
 		$item = $node;
 		while (!empty($byId)) {
 			try {
-				if ($byId[$item->getId()] !== []) {
+				if (isset($byId[$item->getId()]) && $byId[$item->getId()] !== []) {
 					$path = $this->getMountedPath($item);
 					foreach ($byId[$item->getId()] as $uid => $token) {
 						$results[$uid] = [