Add no coupons class to the div wrapper

Hi,

This is a tiny suggestion for the next update of the plugin. If you visit here https://i.imgur.com/0BToNFf.png, in the account section, if there are no available coupons the no coupons message is being displayed but the wrapping div doesn’t have .no-coupons class added. So my request is to add a no coupons class to the div wrapping the message whenever there is no coupons to display so that we can apply the styles accordingly. This is gonna be a great help for some of us to enhance the UI design when there is no coupon instead of just a message. I would really appreciate if you can make that happen in the next update.

Thanks and regards!