Sometimes a documents lc_sent_date is None; don't let the last-call feed break if that happens.

 - Legacy-Id: 1685

Author: levkowetz

ietf/idtracker/feeds.py

@@ -59,5 +59,5 @@ def items(self):
     def item_pubdate(self, item):
         # this method needs to return a datetime instance, even
         # though the database has only date, not time 
-        return datetime.datetime.combine(item.document().lc_sent_date, datetime.time(0,0,0))
+        return datetime.datetime.combine((item.document().lc_sent_date or datetime.datetime.now().date()), datetime.time(0,0,0))