"Team uploads" not recognised

When performing a "Team upload" the warning is shown:

The uploader is not in the package's "Maintainer" or "Uploaders" fields

This is an incorrect warning, as the uploader should not be present for team uploads.

See https://wiki.debian.org/TeamUpload for more on team uploads.

Originally reported by @irl at https://alioth.debian.org/tracker/index.php?func=detail&aid=315115&group_id=100127&atid=413115

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information