Fixed wrong user variable in lookup.html template for edit link (was user should be found_user).
There is no DeveloperForm in site/user/profile.py changed that to LookupForm.
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)