Prevented Django from running with an empty secret key. Refs #17800.

import warnings

from django.conf import global_settings

from django.core.exceptions import ImproperlyConfigured

from django.utils.functional import LazyObject, empty

from django.utils import importlib

                setattr(self, setting, setting_value)

        if not self.SECRET_KEY:

            warnings.warn("The SECRET_KEY setting must not be empty.", DeprecationWarning)

            raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")

        if hasattr(time, 'tzset') and self.TIME_ZONE:

            # When we can, attempt to validate the timezone. If we can't find