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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 from_array(array):
 """ Deserialize a new PassportElementErrorUnspecified from a given dictionary. :return: new PassportElementErrorUnspecified instance. :rtype: PassportElementErrorUnspecified """

        if array is None or not array:
            return None
        # end if
        assert_type_or_raise(array, dict, parameter_name="array")

        data = {}
        data['source'] = u(array.get('source'))
        data['type'] = u(array.get('type'))
        data['element_hash'] = u(array.get('element_hash'))
        data['message'] = u(array.get('message'))

        instance = PassportElementErrorUnspecified(**data)
        instance._raw = array
        return instance