code: def _GetStringValue(self, data_dict, name, default_value=None):
      
      values = data_dict.get(name, None)
      if not values:
        return default_value
  
      for index, value in enumerate(values):
        if ',' in value:
          values[index] = '"{0:s}"'.format(value)
  
      return ', '.join(values)
docs: Retrieves a specific string value from the data dict.
  
      Args:
        data_dict (dict[str, list[str]): values per name.
        name (str): name of the value to retrieve.
        default_value (Optional[object]): value to return if the name has no value
            set in data_dict.
  
      Returns:
        str: value represented as a string.