Merged in a fix from Ole. A different fix for the same problem was already present, but by picking Ole's fix here we avoid hassle in the next (Django-upgrade) merge.

- Legacy-Id: 6993

ietf/meeting/helpers.py

@@ -114,7 +114,7 @@ def get_wg_list(scheduledsessions):
 
 def get_meeting(num=None):
     if num == None:
-        meeting = Meeting.objects.filter(type="ietf", agenda__isnull=False).order_by("-date")[:1].get()
+        meeting = Meeting.objects.filter(type="ietf").exclude(agenda=None).order_by("-date")[:1].get()
     else:
         meeting = get_object_or_404(Meeting, number=num)
     return meeting