do not connect to down or hidden node

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@606 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/client/app.py

@@ -145,6 +145,8 @@ class ConnectionPool(object):
     def getConnForNode(self, node):
         """Return a locked connection object to a given node
         If no connection exists, create a new one"""
+        if node.getNodeState() in (DOWN_STATE, HIDDEN_STATE):
+            return None
         uuid = node.getUUID()
         self.connection_lock_acquire()
         try: