message: Fix a Python exception during congresses
diff: @@ -658,7 +658,7 @@ class Congress:
  if plot.isOwned(): convertPlotCulture(plot, iPlayer, 100, True)
  if player(iPlayer).isHuman():
  - makeUnit(iPlayer, iSettler, tPlot)
  + makeUnit(iPlayer, iSettler, plot)
  else:
  player(iPlayer).found(x, y)
  