Catch IndexError from choice() only.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2292 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/replicator.py

@@ -184,11 +184,11 @@ class Replicator(object):
     def _startReplication(self):
         # Choose a storage node for the source.
         app = self.app
-        try:
         cell_list = app.pt.getCellList(self.current_partition.getRID(),
                                        readable=True)
         node_list = [cell.getNode() for cell in cell_list
                         if cell.getNodeState() == NodeStates.RUNNING]
+        try:
             node = choice(node_list)
         except IndexError:
             # Not operational.