First of all, thank you for coming up with another great solution... yours always work!
On the other hand there seems to be a problem with Google and I am sure that it doesn't come from this contribution as I retried with the older version and had the same result : Google says that the sitemapindex is "empty" !!! Looking at it and the others (categories, products, etc) all is correctly filled and comes up when called, the sitemap generator has no warnings but after submitting and resubmitting and even going to their validator which says that the sitempas are valid in Google Tools they are lisred each time with a warning "Empty". Have you had this happen and if so is there a solution ?
Thank you for your help!