code: def get_as_nullable_parameters(self, key):
          
          value = self.get_as_nullable_map(key)
          return Parameters(value) if value != None else None
docs: Converts map element into an Parameters or returns null if conversion is not possible.
  
          :param key: a key of element to get.
  
          :return: Parameters value of the element or null if conversion is not supported.