"str in REQUEST" construct only works for zope 2.8

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18051 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/ERP5Site_getCurrentDialogAction.xml

@@ -66,7 +66,7 @@
         <item>
             <key> <string>_body</string> </key>
             <value> <string>request = container.REQUEST\n
-if \'dialog_action_url\' in request:\n
+if request.get(\'dialog_action_url\'):\n
   current_url = request[\'dialog_action_url\']\n
   for action in dialog_actions:\n
     if current_url == action[\'original_url\']:\n