message: Hide warning on successful authentication
diff: @@ -125,11 +125,8 @@ impl SpotifyClientCredentials {
  REDIRECT_URI='your-app-redirect-url'
  Get your credentials at `https://developer.spotify.com/my-applications`";
  println!("SpotifyClientCredentials.default(): client_id:{:?}, client_secret:{:?} empty_flag:{:?}",self.client_id, self.client_secret, !(self.client_id.is_empty()||self.client_secret.is_empty())&&self.token_info.is_none());
  - let empty_flag = if self.client_id.is_empty() || self.client_secret.is_empty() {
  - true
  - } else {
  - self.token_info.is_none()
  - };
  + let empty_flag = (self.client_id.is_empty() || self.client_secret.is_empty())
  + && self.token_info.is_none();
  if empty_flag {
  eprintln!("{}", ERROR_MESSAGE);
  } else {
  