laravel/cashier — pull request #92 by ashitvora (2014-07-21 12:53:44+00:00)
Title: Not fetching last four digits of a card if there's no default card

Stripe allows us to create a customer without any card.
In that case trying to fetch last four digits of the default card after user is subscribed to a plan throws error.
This is possible when user is trying to subscribe to a free plan and app doesn't require them to enter their credit card info.