Fix node template

Author: ivankamkin

codegen/Templates/nodejs/api.mustache

@@ -470,6 +470,7 @@ export class {{classname}} {
 
 {{#formParams}}
     {{^isFile}}
+    {{^vendorExtensions.x-param-group-camel}}
         if (request.{{paramName}} != null) {
             {{^isListContainer}}
             formParams.push(['{{baseName}}', ObjectSerializer.serialize(request.{{paramName}}, {{#isString}}'string'{{/isString}}{{^isString}}'{{{dataType}}}'{{/isString}})]);
@@ -480,6 +481,12 @@ export class {{classname}} {
             }
             {{/isListContainer}}
         }
+    {{/vendorExtensions.x-param-group-camel}}
+    {{#vendorExtensions.x-param-group-camel}}
+        if (request.{{vendorExtensions.x-param-group-camel}}?.{{paramName}} != null) {
+            formParams.push(['{{baseName}}', ObjectSerializer.serialize(request.{{vendorExtensions.x-param-group-camel}}.{{paramName}}, {{#isString}}'string'{{/isString}}{{^isString}}'{{{dataType}}}'{{/isString}})]);
+        }
+    {{/vendorExtensions.x-param-group-camel}}
     {{/isFile}}
 {{/formParams}}
         const requestOptions: ApiRequestOptions = {