Marketpress shopping cart page text

In the "Messages" tab of Marketpress's settings, there is a place for text that is supposed to appear on the Shopping Cart page. But that text doesn't appear on the shopping cart page when the shopping cart is empty; instead it just says "There are no items in your cart."

--Why doesn't the shopping cart text show in the shopping cart when it's empty, and when will Marketpress be fixed so that it does?

--How can I edit/format that "There are no items in your cart." text?