adding message from client to sync and disabling sending transactions to the queue while syncing

sync/src/lib.rs

@@ -173,6 +173,9 @@ impl NetworkProtocolHandler<SyncMessage> for EthSync {
 			SyncMessage::NewChainHead => {
 				let mut sync_io = NetSyncIo::new(io, self.chain.deref());
 				self.sync.write().unwrap().chain_new_head(&mut sync_io);
+			},
+			SyncMessage::BlockQueueEmpty => {
+				self.sync.write().unwrap().client_block_queue_empty();
 			}
 			_ => {/* Ignore other messages */},
 		}