Treat TP_CONNECTION_PRESENCE_TYPE_UNSET as _AVAILABLE
Treat TP_CONNECTION_PRESENCE_TYPE_UNSET as _AVAILABLE

In case a CM doesn't have the presence interface a contacts presence will be
reported as _UNSET. Treating this as _AVAILABLE causes these contacts to
show up in the UI

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets