ConnectorConnectionClosedException might get triggered when notifying a
node about transaction abortion, causing tpc_abort to fail eating pending
answers and clearing local_var.
Swallow all exceptions (various network problems translating to various
exceptions).

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2164 71dcc9de-d417-0410-9af5-da40c76e7ee4