message: Cleanups suggested in the review
diff: @@ -379,13 +379,12 @@ impl<'cfg, 'a> InstallablePackage<'cfg, 'a> {
  let example_features = binaries[0]
  .required_features()
  .map(|f| f.join(" "))
  - .unwrap_or_else(|| String::new());
  - let consider_enabling_message = format!("Consider enabling some of them by passing, e.g., `--features=\"{example_features}\"`");
  + .unwrap_or_default();
  let message = format!(
  "\
  none of the package's binaries are available for install using the selected features
  {target_features_message}
  -{consider_enabling_message}"
  +Consider enabling some of them by passing, e.g., `--features=\"{example_features}\"`"
  );
  self.config.shell().warn(message)?;
  }
  