message: Remove confusing `map()`
diff: @@ -83,8 +83,7 @@ fn get_github_fields(path: &str) -> Result<GitHubFields> {
  .basic_auth(
  env::var("CRATESFYI_GITHUB_USERNAME")
  .ok()
  - .and_then(|u| Some(u.to_string()))
  - .unwrap_or("".to_string()),
  + .unwrap_or_default(),
  env::var("CRATESFYI_GITHUB_ACCESSTOKEN").ok(),
  )
  .send()?;
  