netbox-community-netbox/netbox/templates/dcim/inc/endpoint_connection.html

{% if path.destination_id %}
    {% with endpoint=path.destination %}
        <td><a href="{{ endpoint.parent_object.get_absolute_url }}">{{ endpoint.parent_object }}</a></td>
        <td><a href="{{ endpoint.get_absolute_url }}">{{ endpoint }}</a></td>
    {% endwith %}
{% else %}
    <td colspan="2" class="text-muted">Not connected</td>
{% endif %}