update replicator only if it exists

git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@703 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/hidden.py

@@ -122,7 +122,7 @@ class HiddenEventHandler(EventHandler):
                 nm.add(node)
             pt.setCell(offset, node, state)
 
-            if uuid == app.uuid:
+            if uuid == app.uuid and app.replicator is not None:
                 # If this is for myself, this can affect replications.
                 if state == DISCARDED_STATE:
                     app.replicator.removePartition(offset)