fix Tendermint extra_info: allow non-proposal messages

Author: Andronik Ordian

ethcore/src/engines/tendermint/mod.rs

@@ -451,12 +451,12 @@ impl Engine<EthereumMachine> for Tendermint {
 
 	/// Additional engine-specific information for the user/developer concerning `header`.
 	fn extra_info(&self, header: &Header) -> BTreeMap<String, String> {
-		let message = ConsensusMessage::new_proposal(header).expect("Invalid header.");
+		let view = consensus_view(header).expect("Invalid header view.");
+		let height = header.number() as Height;
 		map![
-			"signature".into() => message.signature.to_string(),
-			"height".into() => message.vote_step.height.to_string(),
-			"view".into() => message.vote_step.view.to_string(),
-			"block_hash".into() => message.block_hash.as_ref().map(ToString::to_string).unwrap_or("".into())
+			"height".into() => height.to_string(),
+			"view".into() => view.to_string(),
+			"block_hash".into() => header.bare_hash().to_string()
 		]
 	}
 
@@ -945,6 +945,8 @@ mod tests {
 		seal[2] = ::rlp::encode_list(&vec![H520::from(signature1.clone()), H520::from(signature0.clone())]).into_vec();
 		header.set_seal(seal.clone());
 
+		engine.extra_info(&header);
+
 		assert!(engine.verify_block_external(&header).is_ok());
 
 		let bad_voter = insert_and_unlock(&tap, "101");