message: Cleanup spaces.
diff: @@ -687,7 +687,6 @@ mod tests {
  r#"{"support_revocation":false}"#.to_string(),
  "Optional".to_owned()).unwrap();
  let proof_string = to_string(handle).unwrap();
  - println!("{}", proof_string);
  let s: Value = serde_json::from_str(&proof_string).unwrap();
  assert_eq!(s["version"], DEFAULT_SERIALIZE_VERSION);
  assert!(!proof_string.is_empty());
  