message: Fix credentials message appearing when using OAuth
diff: @@ -124,10 +124,10 @@ impl SpotifyClientCredentials {
  CLIENT_SECRET='your-spotify-client-secret'
  REDIRECT_URI='your-app-redirect-url'
  Get your credentials at `https://developer.spotify.com/my-applications`";
  - let empty_flag = if self.client_id.is_empty() {
  + let empty_flag = if self.client_id.is_empty() || self.client_secret.is_empty() {
  true
  } else {
  - self.client_secret.is_empty()
  + self.token_info.is_none()
  };
  if empty_flag {
  eprintln!("{}", ERROR_MESSAGE);
  