removed unnecessary import

cash/models.py

@@ -5,7 +5,6 @@ from django.contrib.auth.models import User
 from django.db.models.signals import pre_save, post_save
 from django.db.models.signals import pre_delete
 from django.dispatch import receiver
-from django_auth_ldap.backend import populate_user
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext_noop
 from django.db import transaction