Co-authored-by: Confiks <confiks@scriptbase.org>

When downloading a new public key of an issuer of which some public keys had already been used, the new public key would not be parsed resulting in a nil deref during keyshare sessions.

When downloading a new public key of an issuer of which some public keys had already been used, the new public key would not be parsed resulting in a nil deref during keyshare sessions.