message: add a unit test for querying the supply of a non-existing denom
diff: @@ -1113,6 +1113,16 @@ mod tests {
  .unwrap();
  let res: SupplyResponse = from_binary(&fly).unwrap();
  assert_eq!(res.amount, coin(777, "FLY"));
  +
  + // if a denom does not exist, should return zero amount, instead of throwing an error
  + let atom = bank
  + .query(&BankQuery::Supply {
  + denom: "ATOM".to_string(),
  + })
  + .unwrap()
  + .unwrap();
  + let res: SupplyResponse = from_binary(&atom).unwrap();
  + assert_eq!(res.amount, coin(0, "ATOM"));
  }
  #[test]
  