make_sample_issues command not working without Stripe
The make_sample_issues command currently does not work when running locally without Stripe. Attempting to run it throws:
RuntimeError: Model class djstripe.models.base.IdempotencyKey doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
Running with Stripe solves the problem, but I presume we don't want to require that for this command.