templates/round_robin_fallback_email.html

<p>
    The following {{ plural('calendar needs', calendars, pword='calendar need') }} to be updated in order to have a triage owner:
</p>
<ul>
    {% for name, calendar in calendars.items() -%}
        {% if calendar['nobody'] -%}
            <li>{{ name }}: no triage owner for the next week.</li>
        {% else -%}
            <li>
                {{ name }}: cannot find the following {{ plural('person', calendar['persons']) }}:
                <ul>
                    {% for person in calendar['persons'] -%}
                        <li>{{ person }}</li>
                    {% endfor -%}
                </ul>
            </li>
        {% endif -%}
    {% endfor -%}
</ul>