The way the ToC wizard works is that it generates both the text and the link for each toc entry, you cannot use it just to generate text. So therefore it requires a tag in the body with text included. If for some reason you dont want that text displayed, the way to do it, as davidfor mentioned is to simply hide it with CSS, the the ToC wizard will read it and link to it, but it wont be visible when the book is read.
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