message: Fix a null pointer error
diff: @@ -197,7 +197,7 @@ def calculateTotalPlagueHealth(iPlayer, iPlague):
  def startPlague(iPlague):
  iPlayer = players.major().alive().where(isVulnerable).minimum(lambda iPlayer: calculateTotalPlagueHealth(iPlayer, iPlague))
  - if calculateTotalPlagueHealth(iPlayer, iPlague) <= 200:
  + if iPlayer and calculateTotalPlagueHealth(iPlayer, iPlague) <= 200:
  city = cities.owner(iPlayer).random()
  if city:
  spreadPlague(iPlayer)
  