erp5_web_renderjs_ui_test: Make sure relation field is loaded properly

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

@@ -155,7 +155,11 @@
 
 <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>waitForValue</td>
+  <td>//input[@name="field_my_successor_title"]</td>
+  <td>2</td>
+</tr>
 <tr>
   <td>assertValue</td>
   <td>//input[@name="field_my_successor_title"]</td>