Check if the response is an OAuth error response.
        :param response: the OIDC response
        :type response: oic.oic.message
        :raise SATOSAAuthenticationError: if the response is an OAuth error response

def _check_error_response(self, response, context):
        """
        Check if the response is an OAuth error response.
        :param response: the OIDC response
        :type response: oic.oic.message
        :raise SATOSAAuthenticationError: if the response is an OAuth error response
        """
        if "error" in response:
            satosa_logging(logger, logging.DEBUG, "%s error: %s %s" %
                           (type(response).__name__, response["error"], response.get("error_description", "")),
                           context.state)
            raise SATOSAAuthenticationError(context.state, "Access denied")