Hi,
To edit this view, you can edit the file "product / listing_img_title" or another listing depending on which one is used.
You have to go in HikaShop > Display > Views.
To have a different view only when the cart is empty, you can add a parameter in the url when the cart is cleared, for example: "MYSITE/index.php/component/hikashop/product/listing/cart-empty"
and then in the view file add controls to display your text, like: "if(JRequest::getString('cart','default')=='empty'{echo "Your text";}"