Stopping request when exception occurs (admin interface)

Hi there,

Hopefully an easy question. I've overridden save_model() in my admin page, and I'm wrapping my obj.save() call in a try/catch so that I can catch a RecordModifiedError. 

    def save_model(self, request, obj, form, change):

             

        from concurrency.exceptions import RecordModifiedError

        from django.http import HttpResponse

        try: 

                

            obj.save()

            #other stuff

        except RecordModifiedError:

            self.message_user(request,

                            "[!] Record modified. Please try again.",

                            level="error")

            return None

The message saying record modified is shown when it should be. However, there is also a message at the top saying that the save was successful, when in fact it was not. 

What's the proper way to stop the success message from occurring? Can I clear it, or stop the request? Return None doesn't seem to help.

Thanks!

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