set cache to failedcache when shared storage init fails

Signed-off-by: Robin Appelman <robin@icewind.nl>

apps/files_sharing/lib/SharedStorage.php

@@ -124,13 +124,16 @@ class SharedStorage extends \OC\Files\Storage\Wrapper\Jail implements ISharedSto
 		} catch (NotFoundException $e) {
 			// original file not accessible or deleted, set FailedStorage
 			$this->storage = new FailedStorage(['exception' => $e]);
+			$this->cache = new FailedCache();
 			$this->rootPath = '';
 		} catch (NoUserException $e) {
 			// sharer user deleted, set FailedStorage
 			$this->storage = new FailedStorage(['exception' => $e]);
+			$this->cache = new FailedCache();
 			$this->rootPath = '';
 		} catch (\Exception $e) {
 			$this->storage = new FailedStorage(['exception' => $e]);
+			$this->cache = new FailedCache();
 			$this->rootPath = '';
 			$this->logger->logException($e);
 		}

apps/files_sharing/tests/SharedStorageTest.php

@@ -577,8 +577,8 @@ class SharedStorageTest extends TestCase {
 		]);
 
 		// trigger init
-		$this->assertInstanceOf(\OC\Files\Cache\FailedCache::class, $storage->getCache());
 		$this->assertInstanceOf(\OC\Files\Storage\FailedStorage::class, $storage->getSourceStorage());
+		$this->assertInstanceOf(\OC\Files\Cache\FailedCache::class, $storage->getCache());
 	}
 
 	public function testInitWithNotFoundSource() {
@@ -594,7 +594,7 @@ class SharedStorageTest extends TestCase {
 		]);
 
 		// trigger init
-		$this->assertInstanceOf(\OC\Files\Cache\FailedCache::class, $storage->getCache());
 		$this->assertInstanceOf(\OC\Files\Storage\FailedStorage::class, $storage->getSourceStorage());
+		$this->assertInstanceOf(\OC\Files\Cache\FailedCache::class, $storage->getCache());
 	}
 }