If we can't receive the presence of a contact (subscription="none" or "from"), their presence should be Unknown instead of Offline. So, offline contacts to which we are subscribed should have Unknown by default and then switch to Offline once we receive the roster from the server. This is needed to properly display not subscribed contacts in Empathy: https://bugzilla.gnome.org/show_bug.cgi?id=539765
This has been the case for ages (modulo bugs like bug 41743).
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