message: New World civs can only capture slaves after being discovered
diff: @@ -378,6 +378,7 @@ class CvRFCEventHandler:
  utils.captureUnit(pLosingUnit, pWinningUnit, iAztecSlave, 35)
  elif iLosingPlayer == iNative:
  + if iWinningPlayer not in lCivBioNewWorld or True in data.lFirstContactConquerors:
  if gc.getPlayer(iWinningPlayer).isSlavery() or gc.getPlayer(iWinningPlayer).isColonialSlavery():
  utils.captureUnit(pLosingUnit, pWinningUnit, iSlave, 35)
  