Fix unexpected error with wallet power updates (#1994)

Merge pull request #1994

Fix unexpected error with wallet power updates

base_layer/wallet/src/transaction_service/service.rs

@@ -1228,9 +1228,13 @@ where
             PowerMode::Low => self.config.low_power_polling_timeout,
             PowerMode::Normal => self.config.base_node_monitoring_timeout,
         };
-        self.timeout_update_publisher
-            .send(timeout)
-            .map_err(|_| TransactionServiceError::ProtocolChannelError)?;
+        if let Err(e) = self.timeout_update_publisher.send(timeout) {
+            trace!(
+                target: LOG_TARGET,
+                "Could not send Timeout update, no subscribers to receive. (Err {:?})",
+                e
+            );
+        }
 
         Ok(())
     }

base_layer/wallet/tests/transaction_service/service.rs

@@ -1813,6 +1813,9 @@ fn transaction_base_node_monitoring() {
     let (_, _, bob_outbound_service, mut bob_tx_sender, _, _, _, _) =
         setup_transaction_service_no_comms(&mut runtime, factories.clone(), TransactionMemoryDatabase::new(), None);
 
+    runtime.block_on(alice_ts.set_low_power_mode()).unwrap();
+    runtime.block_on(alice_ts.set_normal_power_mode()).unwrap();
+
     let mut alice_total_available = 250000 * uT;
     let (_utxo, uo) = make_input(&mut OsRng, alice_total_available, &factories.commitment);
     runtime.block_on(alice_output_manager.add_output(uo)).unwrap();