upgraded_path in ics07-tendermint was removed

[yito88]

Bug Summary

I'm testing the client upgrade with Namada.
The upgraded_path was removed and the verification panicked.

Details

When the upgrade_path has only one, the first upgrade path was removed by upgrade_path.pop() and the next check for upgrade_path[0] panicked.

ibc-rs/ibc-clients/ics07-tendermint/src/client_state/common.rs

Lines 190 to 198 in b820866

	let mut upgrade_path = client_state.upgrade_path.clone();
	if upgrade_path.pop().is_none() {
	return Err(ClientError::ClientSpecific {
	description: "cannot upgrade client as no upgrade path has been set".to_string(),
	});
	};
	let upgrade_path_prefix = CommitmentPrefix::from(upgrade_path[0].clone().into_bytes());

Version

0.53.0