if any(_recipients['model'] == 'django_webix_sender.ExternalSubject' for _recipients in CONF['recipients']):
        operations.append(migrations.AddField(
            model_name='externalsubject',
            name='typology',
            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='django_webix_sender.ExternalSubjectTypology', verbose_name='Typology'),