Fix #386: Thread error in notify out

It's quite trivial, so skip changelog


git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@3536 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/python/isc/notify/notify_out.py

@@ -367,6 +367,7 @@ class NotifyOut:
                     zone_id = self._waiting_zones.pop(0) 
                     self._notify_infos[zone_id].prepare_notify_out()
                     self.notify_num += 1 
+                    self._notifying_zones.append(zone_id)
 
     def _send_notify_message_udp(self, zone_notify_info, addrinfo):
         msg, qid = self._create_notify_message(zone_notify_info.zone_name,