If your library is empty, Abundance can prevent you from losing the game for being unable to draw a card. If an effect or turn-based action would cause you to draw a card, you can replace that draw with Abundance's replacement effect. (It doesn't matter that you'd be unable to actually draw a card.) Since Abundance's effect has you put a card into your hand instead of drawing a card, you'll never be forced to draw a card with an empty library.