Avoid a KeyError when an author has no name.
According to https://datatracker.ietf.org/doc/html/rfc4287#section-3.2.1 it should never happen:
Person constructs MUST contain exactly one "atom:name" element.
but I've seen this happen in prod.
According to https://datatracker.ietf.org/doc/html/rfc4287#section-3.2.1 it should never happen:
Person constructs MUST contain exactly one "atom:name" element.
but I've seen this happen in prod.