[erp5_web_renderjs_ui_test] Wait for element to be asynchronously added

bt5/erp5_web_renderjs_ui_test/PathTemplateItem/portal_tests/renderjs_ui_zuite/relationfield_zuite/testMultiRelationFieldCreate.zpt

@@ -238,7 +238,11 @@
   <td>Another Foo</td>
 </tr>
 
-
+<tr>
+  <td>waitForElementPresent</td>
+  <td>//div[@data-gadget-scope='field_my_bar_category_title_list']//fieldset[1]//a[contains(@class, "ui-icon-plane")]</td>
+  <td></td>
+</tr>
 <tr>
   <td>click</td>
   <td>//div[@data-gadget-scope='field_my_bar_category_title_list']//fieldset[1]//a[contains(@class, "ui-icon-plane")]</td>