Remove polymodel folder from DEFAULT_APP_DIRS variable in make_release script.
Patch by: Pawel Solyga, Sverre Rabbelier
from django.core.management.base import NoArgsCommand
class Command(NoArgsCommand):
help = "Validates all installed models."
requires_model_validation = False
def handle_noargs(self, **options):
self.validate(display_num_errors=True)