Fix warnings. (#4768)

substrate/bin/node-template/src/cli.rs

@@ -90,7 +90,9 @@ where
 
 	let _ = exit_send.send(());
 
-	runtime.block_on(handle);
+	if let Err(e) = runtime.block_on(handle) {
+		log::error!("Error running node: {:?}", e);
+	}
 
 	match service_res {
 		Either::Left((res, _)) => res.map_err(error::Error::Service),

substrate/bin/node-template/src/service.rs

@@ -11,7 +11,6 @@ use sc_executor::native_executor_instance;
 pub use sc_executor::NativeExecutor;
 use sp_consensus_aura::sr25519::{AuthorityPair as AuraPair};
 use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
-use futures::{FutureExt, compat::Future01CompatExt};
 
 // Our native executor instance.
 native_executor_instance!(