Changed check_audio_files() to only consider sessions on the official

schedule.  Fixes some 500 errors.  Commit ready to merge.
 - Legacy-Id: 11697

Author: rpcross

ietf/secr/proceedings/proc_utils.py

@@ -40,11 +40,11 @@ def check_audio_files(group,meeting):
     Example: ietf90-salonb-20140721-1710-pm3.mp3
     
     '''
-    for session in Session.objects.filter(group=group,meeting=meeting,status='sched'):
-        try:
-            timeslot = session.official_timeslotassignment().timeslot
-        except IndexError:
-            continue
+    for session in Session.objects.filter(group=group,
+                                          meeting=meeting,
+                                          status=('sched'),
+                                          timeslotassignments__schedule=meeting.agenda):
+        timeslot = session.official_timeslotassignment().timeslot
         if not (timeslot.location and timeslot.time):
             continue
         room = timeslot.location.name.lower()