allow handlers to specify no function (some just change the state)
allow handlers to specify no function (some just change the state)


20060830222959-418b8-9b73f70a36d2848b1c86cece8f287755b05cbbf1.gz

mlundblad/telepathy-gabble,Distrotech/telepathy-glib,Ziemin/telepathy-gabble,jku/telepathy-gabble,community-ssu/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,Distrotech/telepathy-glib,community-ssu/telepathy-gabble,Distrotech/telepathy-glib,mlundblad/telepathy-gabble,community-ssu/telepathy-gabble,jku/telepathy-gabble,Distrotech/telepathy-glib,Distrotech/telepathy-glib,community-ssu/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble