multitenant: fix django 1.8 compatibility code (bis) (#28039)

hobo/multitenant/management/commands/tenant_command.py

@@ -8,6 +8,7 @@
 import argparse
 import sys
 
+import django
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.core.management.base import (BaseCommand, CommandError,