default to None in REQUEST.get()

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5425 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_accounting/ActionTemplateItem/portal_types/Organisation/jump_active_accounting_pref.xml

@@ -106,7 +106,7 @@
       <dictionary>
         <item>
             <key> <string>text</string> </key>
-            <value> <string>python:object.REQUEST.get(\'form_id\') == \'Entity_viewAccountingTransactionList\'</string> </value>
+            <value> <string>python:object.REQUEST.get(\'form_id\', None) == \'Entity_viewAccountingTransactionList\'</string> </value>
         </item>
       </dictionary>
     </pickle>