preserve notification_message's category and language only if notification_message is found.

this commit fixes a regression in ecb09a0d.

product/ERP5/Tool/PasswordTool.py

@@ -191,17 +191,18 @@ class PasswordTool(BaseTool):
                 "Thank you",
                 mapping=message_dict)
       message = message.translate()
+      event_keyword_argument_dict={}
     else:
       subject = notification_message.getTitle()
       if notification_message.getContentType() == "text/html":
         message = notification_message.asEntireHTML(substitution_method_parameter_dict=message_dict)
       else:
         message = notification_message.asText(substitution_method_parameter_dict=message_dict)
-
       event_keyword_argument_dict={
         'resource':notification_message.getSpecialise(),
         'language':notification_message.getLanguage(),
       }
+
     self.getPortalObject().portal_notifications.sendMessage(sender=sender, recipient=[user,],
                                                             subject=subject, message=message,
                                                             store_as_event=store_as_event,