message: Fix clippy error: Manual implementation of `Option::map`
diff: @@ -103,12 +103,12 @@ where
  {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  f.debug_map()
  - .entries(self.0.iter().enumerate().filter_map(|(key, entry)| {
  - match entry {
  - Some(entry) => Some((key, entry)),
  - None => None,
  - }
  - }))
  + .entries(
  + self.0
  + .iter()
  + .enumerate()
  + .filter_map(|(key, entry)| entry.as_ref().map(|entry| (key, entry))),
  + )
  .finish()
  }
  }
  