def get_email_html_body(self):
        try:
            return self._get_email_field('email_html_body_tmpl', 'get_email_html_body')
        except ImproperlyConfigured:
            return None
Validates network RBAC policy changes.
dataset/ETHPy150Open Nomadblue/django-nomad-notifier/notifier/models.py/NotificationMixin.get_email_html_body--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/db/db_base_plugin_v2.py/NeutronDbPluginV2.validate_network_rbac_policy_change