vcard-manager.c: Add a FIXME to use error.c, as per Daf's review
vcard-manager.c: Add a FIXME to use error.c, as per Daf's review

jku/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble