[[ https://sentry.softwareheritage.org/share/issue/9031250f727d4e92a720997922e7a0e2/ | SWH-LOADER-CORE-XN ]] when loading http://deb.debian.org/debian//pool/main/h/horizon/horizon_14.0.2.orig.tar.gz
Looks like we need to add an optionalmake the `md5sum` argument toof `DebianFileMetadata` optional