Well, to correct Duds and Sophia error here you have a new corrected version. In fact this version has some additions:

• theme_uc_catalog_products() funtions in charge of listing the products verifies if there are products to list, in case there was no products instead of an error message it created a box displaying a "No products are available on that category." message
• rebuilt settings area with three different pages and subtabs navigation for catalog, grid and blocks as is usual on other ubercart settings page for other modules
• rebuilt overview page with all the settings of the previous three pages listed as is usual on other ubercart settings page for other modules
• description under Special Offers block check box explaining which data is listed it lists and what happens if there is no data available
• description under Best Sellers block check box explaining which data is listed and what happens if there is no data available
• new style div.no-products on the css file to adjust how this not available data is displayed

It is based on the last Lyle upload here and on bazaar. Thanks for support and feedback.