Actually warn on empty SECRET_KEY instead of raising a warning as an exception.

                setattr(self, setting, setting_value)

        if not self.SECRET_KEY:

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

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

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

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