message: Fixes - handle S3 not returning last-modified in some cases
diff: @@ -119,7 +119,10 @@ impl S3Backend {
  content.write_all(data.as_ref())?;
  }
  - let date_updated = parse_timespec(&res.last_modified.unwrap())?;
  + let date_updated = res
  + .last_modified
  + .map_or(Ok(Utc::now()), |lm| parse_timespec(&lm))?;
  +
  let compression = res.content_encoding.and_then(|s| s.parse().ok());
  Ok(Blob {
  