tests to see if the namespace exists

        args:
            namespace: the name of the namespace

def has_namespace(self, namespace):
        """ tests to see if the namespace exists

        args:
            namespace: the name of the namespace
        """
        result = requests.get(self._make_url(namespace))
        if result.status_code == 200:
            return True
        elif result.status_code == 404:
            return False