When a new player joins the game, their scores for all objectives is "null" instead of 0

Say a server has a "money" objective, and a new player joins. They don't have 0 money, they have "null" money. So if you did /testfor @a[score_Money=0], it would not find that player, because their money score has not been initialized. However, if an admin set the score to 0, it would be initialized. This bug is very annoying when working with redstone and scoreboards together.