make incorrect data removable

gadget_json_generated_form.js

@@ -616,7 +616,17 @@
       if (default_dict.hasOwnProperty(key)) {
         if (!used_properties.hasOwnProperty(key)) {
           queue
-            .push(render_field.bind(g, g, key, path, undefined, default_dict[key], root));
+            .push(
+              addSubForm.bind(g, {
+                gadget: g,
+                property_name: key,
+                path: path,
+                schema_path: "",
+                schema_part: undefined,
+                default_dict: default_dict[key]
+              })
+            )
+            .push(root_append);
         }
       }
     }