call-window: use empathy_call_handler_get_contact()
call-window: use empathy_call_handler_get_contact()

I'm sure those bugs are because we were using g_object_get() directly.

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