message: [txpool]: check err when broadcast new txns
diff: @@ -154,8 +154,10 @@ impl StreamHandler<TxnStatusEvent> for TxPoolActor {
  .clone()
  .broadcast(PropagateNewTransactions::from(txns))
  .into_actor(self)
  - .then(|_res, act, _ctx| {
  - error!("fail to emit propagate new txn event");
  + .then(|res, act, _ctx| {
  + if let Err(e) = res {
  + error!("fail to emit propagate new txn event, err: {}", &e);
  + }
  async {}.into_actor(act)
  })
  .wait(ctx);
  