templates/revision-info: Display author fullname when name is None
See tip revision box at https://archive.softwareheritage.org/browse/revision/8245c4221d53415eea90b1a0e2d51a2270e42b33/?origin_url=opam%2Bhttps://opam.ocaml.org/packages/cudf/
Migrated from D6535 (view on Phabricator)