If there's no person, output a "missing info" line instead of a blank

line.  Makes explicit the problem 1 in ticket adamlaska#232 instead of implying
that we've supplied all the information.
 - Legacy-Id: 924

Author: fenner

ietf/templates/idindex/internetdraft_detail.html

@@ -41,7 +41,11 @@ <h2>{{ object.filename }}-{{ object.revision_display }}</h2>
 {% if author.email %}
 <a href="mailto:{{ author.email }}">{{ author.person }}</a>
 {% else %}
+{% if author.person %}
 {{ author.person }}
+{% else %}
+Missing author info #{{ author.person_id }}
+{% endif %}
 {% endif %}
 <br>
 {% endfor %}