Merge pull request #18931 from owncloud/fix-files_sharing-breakage

Check if files_sharing is actually enabled before using it

ocs/routes.php

@@ -104,6 +104,7 @@ API::register(
 );
 
 // Server-to-Server Sharing
+if (\OC::$server->getAppManager()->isEnabledForUser('files_sharing')) {
 	$s2s = new \OCA\Files_Sharing\API\Server2Server();
 	API::register('post',
 		'/cloud/shares',
@@ -132,3 +133,4 @@ API::register('post',
 		'files_sharing',
 		API::GUEST_AUTH
 	);
+}