Stop auto-correcting string INSTALLED_APPS, TEMPLATE_DIRS settings, as per deprecation TL.

                % (self.SETTINGS_MODULE, e)

            )

        # Settings that should be converted into tuples if they're mistakenly entered

        # as strings.

        tuple_settings = ("INSTALLED_APPS", "TEMPLATE_DIRS")

        for setting in dir(mod):

            if setting == setting.upper():

                setting_value = getattr(mod, setting)

                if setting in tuple_settings and \

                        isinstance(setting_value, six.string_types):

                    warnings.warn("The %s setting must be a tuple. Please fix your "

                                  "settings, as auto-correction is now deprecated." % setting,

                                  DeprecationWarning, stacklevel=2)

                    setting_value = (setting_value,) # In case the user forgot the comma.

                setattr(self, setting, setting_value)

        if not self.SECRET_KEY: