By default opencart on the category page, if a category does not have a sub category or does not have a product, then the category page will say “There are no products to list in this category” with the continue button.
Why does this text need to be removed? So the benefits of this module can be used When you need a new custom page and will add a module in that category page.
And if by using the "Clean Category Page" module, the text "There are no products to list in this category" with the continue button will be removed