fix empty bios in meetings

itf/templates/modules/festival/meeting.html

@@ -141,7 +141,11 @@
             <a href="Javascript:return false;">{{ p.name }}</a> {{ p.title }}
           </div>
           <div class="pBio">
-            {{ p.short_bio|markdown }}
+            {% if p.short_bio %}
+                {{ p.short_bio|markdown }}
+            {% else %}
+                No bio available.
+            {% endif %}
           </div>
         </div>
         {% endfor %}