erp5_web_renderjs_ui_test: Stablizing fixup

bt5/erp5_web_renderjs_ui_test/PathTemplateItem/portal_tests/renderjs_ui_relation_field_zuite/testRelationFieldSearchWithListbox.zpt

@@ -178,7 +178,16 @@
 <tal:block metal:use-macro="here/Zuite_CommonTemplateForRenderjsUi/macros/wait_for_content_loaded" />
 <tal:block metal:use-macro="here/Zuite_CommonTemplateForRenderjsUi/macros/wait_for_listbox_loaded" />
 
-
+<tr>
+  <td>waitForElementPresent</td>
+  <td>//input[@name="field_my_successor_title"]</td>
+  <td></td>
+</tr>
+<tr>
+  <td>assertElementPresent</td>
+  <td>//input[@name="field_my_successor_title"]</td>
+  <td></td>
+</tr>
 <tr>
   <td>assertValue</td>
   <td>//input[@name="field_my_successor_title"]</td>