Close dl tags

source/talks.html.twig

@@ -39,6 +39,7 @@ talks:
 {% set found = false %}
 {% for talk in page.talks|reverse if talk.date >= now %}
   {% if loop.first %}
+  {% set found = true %}
     <h2>Upcoming Talks</h2>
     <dl>
   {% endif %}
@@ -52,6 +53,7 @@ talks:
 {% set found = false %}
 {% for talk in page.talks|reverse if talk.date < now %}
   {% if loop.first %}
+    {% set found = true %}
     <h2>Previous Talks</h2>
     <dl>
   {% endif %}