Fixed #17132 -- remove a leftover reference to django.conf.default.urls in...

        if not callback:

            # No handler specified in file; use default

            # Lazy import, since urls.defaults imports this file

            from django.conf.urls import defaults

            callback = getattr(defaults, 'handler%s' % view_type)

            from django.conf import urls

            callback = getattr(urls, 'handler%s' % view_type)

        return get_callable(callback), {}

    def resolve403(self):