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

{% if paths|length > 1 %}
    <td colspan="2">Multiple connections</td>
{% elif paths %}
    {% with endpoint=paths.0.destination %}
        <td><a href="{{ endpoint.parent.get_absolute_url }}">{{ endpoint.parent }}</a></td>
        <td><a href="{{ endpoint.get_absolute_url }}">{{ endpoint }}</a></td>
    {% endwith %}
{% else %}
    <td colspan="2" class="text-muted">Not connected</td>
{% endif %}