Deletes the persistent attributes from the persistence layer.
        :rtype: None
        :raises: :py:class: `ask_sdk_core.exceptions.AttributesManagerException`
            if trying to delete persistence attributes without persistence adapter

def delete_persistent_attributes(self):
        # type: () -> None
        """Deletes the persistent attributes from the persistence layer.
        :rtype: None
        :raises: :py:class: `ask_sdk_core.exceptions.AttributesManagerException`
            if trying to delete persistence attributes without persistence adapter
        """
        if not self._persistence_adapter:
            raise AttributesManagerException(
                "Cannot delete PersistentAttributes without "
                "persistence adapter!")
        if self._persistent_attributes_set:
            self._persistence_adapter.delete_attributes(
                request_envelope=self._request_envelope)
            self._persistence_attributes = {}
            self._persistent_attributes_set = False