It will hurt you that you don't have some, but it won't automatically keep you out of your target schools. You want to me sure to demonstrate a willingness to get involved and hopefully some ethics and compassion through your other activities (including your job). Whatever you do, don't rush out and join a bunch of community service programs just to "get involved!" Take your existing activities, and make sure that your passion for them shines through.
Scott
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Co-Author, Your MBA Game Plan