Code review comment for lp:~widelands-dev/widelands/bug-1842396-no-tribe

We could use
  if (UserSettings::highest_playernum() >= settings.playernum)
which is the check used inside of the throwing get_players_tribe() function to decide whether to throw.
I decided to catch the exception since that is what is done in the other two cases the function is used, but of course we could change those calls as well. The current fix is a copy of those other calls.