I think they are sentence structure problems. you can't omit any from the sentences with "There is/are". Otherwise it sounds like right now there aren't books on the desk.
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TasmanTigerIs it possible to omit 'any' in those sentences ?In pattern B, no, it's not possible. In pattern A, not really. It sounds very strange to omit any even though it's not exactly wrong. It's a special case that requires a contrastive context: