message: Fix a Congresses Python exception
diff: @@ -1132,6 +1132,7 @@ class Congress:
  if not gc.getPlayer(iLoopPlayer).isAlive(): lRemove.append(iLoopPlayer)
  for iLoopPlayer in lRemove:
  + if iLoopPlayer in self.lInvites:
  self.lInvites.remove(iLoopPlayer)
  # Leoreth: America receives an invite if there are still claims in the west
  