AC-7976::[Issue] Introduced support of custom scalar types for GraphQL schema

Author: glo63652

app/code/Magento/GraphQl/Controller/GraphQl.php

@@ -186,6 +186,7 @@ public function dispatch(RequestInterface $request): ResponseInterface
         $data = $this->getDataFromRequest($request);
         $result = [];
 
+        $schema = null;
         $query = $data['query'] ?? '';
         try {
             /** @var Http $request */