"cl_nocountriesifunavailable" CVar to hide country columns if nobody's country is available
On a server that might not have GeoIP location set up, or if by chance everyone's hiding their countries, it'd be nice to not show any of the country columns anymore and see an entire column of "N/A" or question mark flags, as there's not much of a reason to keep them on the scoreboard by that point. Thus, I added a new CVar, cl_nocountriesifunavailable
to toggle this behaviour.