erp5_json_form: Fix react jsonschema to initialize returned data

bt5/erp5_json_form/SkinTemplateItem/portal_skins/erp5_json_form_react_jsonschema_form/react-jsonschema-form-gadget.js.js

@@ -62,7 +62,7 @@ function makeUiSchema(schema, uiSchema, visited) {
   rJS(window)
     .declareMethod('render', function (options) {
       return this.changeState({
-        data: {},
+        data: JSON.parse(options.value),
         value: options.value,
         key: options.key,
         schema_url: options.schema,