ACP2E-4115: Address issues raised in ACP2E-4031

Author: aplapana

app/code/Magento/QuoteGraphQl/Model/OrderResponseFormatter.php

@@ -42,7 +42,7 @@ public function formatResponse(array $executionResult): array
      */
     private function isApplicable(array $executionResult): bool
     {
-        return key_exists(self::NODE_IDENTIFIER, $executionResult['data']);
+        return isset($executionResult['data']) && key_exists(self::NODE_IDENTIFIER, $executionResult['data']);
     }
 
     /**

lib/internal/Magento/Framework/GraphQl/Query/QueryProcessor.php

@@ -51,6 +51,7 @@ class QueryProcessor
      * @param ExceptionFormatter $exceptionFormatter
      * @param QueryComplexityLimiter $queryComplexityLimiter
      * @param ErrorHandlerInterface $errorHandler
+     * @param QueryDataFormatter $formatter
      * @param QueryParser|null $queryParser
      * @SuppressWarnings(PHPMD.LongVariable)
      */