fix(SharedStorage): Check if storage ID is set on cache

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

[skip ci]

Author: solracsf

apps/files_sharing/lib/SharedStorage.php

@@ -53,6 +53,7 @@
 use OCP\Files\Storage\IDisableEncryptionStorage;
 use OCP\Files\Storage\IStorage;
 use OCP\Lock\ILockingProvider;
+use OCP\Server;
 use OCP\Share\IShare;
 use Psr\Log\LoggerInterface;
 
@@ -166,7 +167,7 @@ private function init() {
 			}
 
 			/** @var IRootFolder $rootFolder */
-			$rootFolder = \OC::$server->get(IRootFolder::class);
+			$rootFolder = Server::get(IRootFolder::class);
 			$this->ownerUserFolder = $rootFolder->getUserFolder($this->superShare->getShareOwner());
 			$sourceId = $this->superShare->getNodeId();
 			$ownerNodes = $this->ownerUserFolder->getById($sourceId);
@@ -455,7 +456,7 @@ public function getCache($path = '', $storage = null) {
 		$this->cache = new \OCA\Files_Sharing\Cache(
 			$storage,
 			$sourceRoot,
-			\OC::$server->get(CacheDependencies::class),
+			Server::get(CacheDependencies::class),
 			$this->getShare()
 		);
 		return $this->cache;
@@ -480,7 +481,7 @@ public function getWatcher($path = '', $storage = null): Watcher {
 		// Get node information
 		$node = $this->getShare()->getNodeCacheEntry();
 		if ($node instanceof CacheEntry) {
-			$storageId = $node->getData()['storage_string_id'];
+			$storageId = $node->getData()['storage_string_id'] ?? null;
 			// for shares from the home storage we can rely on the home storage to keep itself up to date
 			// for other storages we need use the proper watcher
 			if (!(str_starts_with($storageId, 'home::') || str_starts_with($storageId, 'object::user'))) {