Not always such a form is used on a Web Page context so be more robust

and check.

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/ERP5Site_viewCredentialRecoveryLoginDialog/text_content.xml

@@ -157,10 +157,7 @@
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
     <pickle>
-      <tuple>
-        <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-        <tuple/>
-      </tuple>
+      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>
     <pickle>
       <dictionary>
@@ -173,16 +170,13 @@
   </record>
   <record id="3" aka="AAAAAAAAAAM=">
     <pickle>
-      <tuple>
-        <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-        <tuple/>
-      </tuple>
+      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>
     <pickle>
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>not:here/getUrlString</string> </value>
+            <value> <string>python: getattr(here, \'getUrlString\', None) is not None and not here.getUrlString()</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_credential/bt/revision

-400
\ No newline at end of file
+401
\ No newline at end of file