How to use the redisgraph.query_result.ResultSetScalarTypes.VALUE_NULL function in redisgraph

def parse_scalar(self, cell):
        scalar_type = int(cell[0])
        value = cell[1]
        scalar = None

        if scalar_type == ResultSetScalarTypes.VALUE_NULL:
            scalar = None

        elif scalar_type == ResultSetScalarTypes.VALUE_STRING:
            if isinstance(value, bytes):
                scalar = value.decode()
            elif not isinstance(value, str):
                scalar = str(value)
            else:
                scalar = value

        elif scalar_type == ResultSetScalarTypes.VALUE_INTEGER:
            scalar = int(value)

        elif scalar_type == ResultSetScalarTypes.VALUE_BOOLEAN:
            value = value.decode() if isinstance(value, bytes) else value
            if value == "true":