Catch exception which is raised if a nomcom NN group has been created, but no nomcom chair has been announced and added yet.

- Legacy-Id: 4385

ietf/announcements/views.py

@@ -4,6 +4,7 @@ from django.views.generic.simple import direct_to_template
 from django.shortcuts import get_object_or_404
 from django.conf import settings
 from django.db.models import Q
+from django.core.exceptions import ObjectDoesNotExist
 
 import re
 
@@ -51,14 +52,18 @@ def nomcomREDESIGN(request):
         e = GroupEvent.objects.filter(group=n, type="changed_state", changestategroupevent__state="conclude").order_by('time')[:1]
         n.end_year = e[0].time.year if e else ""
 
-        chair = n.role_set.select_related().get(name="chair")
-        announcements = Message.objects.filter(related_groups=n).order_by('-time')
-        for a in announcements:
-            a.to_name = address_re.sub("", a.to)
-        
-        regimes.append(dict(chair=chair,
-                            announcements=announcements,
-                            group=n))
+        # A nomcom chair may not exist even if the nomcom NN group has been created:
+        try:
+            chair = n.role_set.select_related().get(name="chair")
+            announcements = Message.objects.filter(related_groups=n).order_by('-time')
+            for a in announcements:
+                a.to_name = address_re.sub("", a.to)
+
+            regimes.append(dict(chair=chair,
+                                announcements=announcements,
+                                group=n))
+        except ObjectDoesNotExist:
+            pass
 
     regimes.sort(key=lambda x: x["group"].start_year, reverse=True)