Why, why, why do you do this? Yes, I have a website field in my K2 listing, but when it happens to be empty, that does not mean I want to include a link to your website. I'm trying to import 250 records, and about half do not have their own URLs. Unless you can tell me how to stop this bit of nonsense, I will otherwise have to go through the database record by record and erase your website address.
How do I import using the Import/Export tool without this "feature" of yours?