Fix "Your cart is empty" on checkout

[jtoar]

For some reason when you go to checkout, "Your cart is empty" is shown in the checkout dropdown:

This probably has something to do with the CartProvider, which uses XState.

[aggmoulik]

Hey @jtoar I am looking into this, will submit a PR.

[adriatic]

Two more comments:

1. Should it be possible to stuff items into cart while not authenticated?
2. Despite the "false" message that the cart is empty, it is possible to click on the checkout and move to the payment page.

The item 1 is by design (I guess), but 2. should not be - unless it is also by design,,, to allow non authenticated people to purchase and pay.

P.S. I do not plan to step on @aggmoulik turf 😄