fix(GraphQL): fix GraphQL requests without variables

Author: jenschude

src/Core/Request/GraphQL/GraphQLQueryRequest.php

@@ -45,10 +45,14 @@ public function buildResponse(ResponseInterface $response)
     public function httpRequest()
     {
         $body = [
-            'query' => $this->query,
-            'variables' => $this->variables,
-            'operationName' => $this->operationName
+            'query' => $this->query
         ];
+        if (count($this->variables) > 0) {
+            $body['variables'] = $this->variables;
+        }
+        if (!is_null($this->operationName)) {
+            $body['operationName'] = $this->operationName;
+        }
         return new JsonRequest(HttpMethod::POST, $this->getPath(), $body);
     }
 

tests/integration/GraphQL/GraphQLQueryTest.php

@@ -76,4 +76,22 @@ public function testGraphQLEndpoint()
             $result['masterData']['staged']['name']
         );
     }
+
+    public function testWithoutVariables()
+    {
+        $request = GraphQLQueryRequest::of();
+
+        $query = <<<GRAPHQL
+query Sphere {
+    products {
+        count
+    }
+}
+GRAPHQL;
+
+        $request->query($query);
+
+        $response = $request->executeWithClient($this->getClient());
+        $this->assertFalse($response->isError());
+    }
 }