Merge pull request dj-stripe#547 from W7PEA/issue-497

Recommended fix for Issue dj-stripe#497

djstripe/management/commands/djstripe_init_customers.py

@@ -22,7 +22,7 @@ class Command(BaseCommand):
 
     def handle(self, *args, **options):
         """Create Customer objects for Subscribers without Customer objects associated."""
-        for subscriber in get_subscriber_model().objects.filter(customer__isnull=True):
+        for subscriber in get_subscriber_model().objects.filter(djstripe_customers=None):
             # use get_or_create in case of race conditions on large subscriber bases
             Customer.get_or_create(subscriber=subscriber)
             print("Created subscriber for {0}".format(subscriber.email))