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fix CardImpl.getRandom when size == 0
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@ -107,6 +107,8 @@ public class CardsImpl extends LinkedHashSet<UUID> implements Cards, Serializabl
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@Override
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public Card getRandom(Game game) {
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if (this.size() == 0)
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return null;
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UUID[] cards = this.toArray(new UUID[0]);
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return game.getCard(cards[rnd.nextInt(cards.length)]);
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}
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