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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def to_nullable_map(value):
 """ Converts JSON string into map object or returns null when conversion is not possible. :param value: the JSON string to convert. :return: Map object value or null when conversion is not supported. """

        if value == None:
            return None

        # Parse JSON
        try:
            value = json.loads(value)
            return RecursiveMapConverter.to_nullable_map(value)
        except:
            return None