do not failed in peerBroken method if node does not exist

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@257 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/master/election.py

@@ -73,10 +73,11 @@ class ElectionEventHandler(MasterEventHandler):
         addr = conn.getAddress()
         node = app.nm.getNodeByServer(addr)
         if isinstance(conn, ClientConnection):
+            if node is not None:
                 node.setState(DOWN_STATE)
             app.negotiating_master_node_set.discard(addr)
         else:
-            if node.getUUID() is not None:
+            if node is not None and node.getUUID() is not None:
                 node.setState(BROKEN_STATE)
         MasterEventHandler.peerBroken(self, conn)
 
@@ -237,7 +238,6 @@ class ElectionEventHandler(MasterEventHandler):
                     continue
                 info = n.getServer() + (n.getUUID() or INVALID_UUID,)
                 known_master_list.append(info)
-
             p = Packet()
             p.answerPrimaryMaster(packet.getId(), primary_uuid, known_master_list)
             conn.addPacket(p)