code: def _get_base_value_unwrapped_as_list(self, entity):
      
      wrapped = self._get_base_value(entity)
      if self._repeated:
        if wrapped is None:
          return []
        assert isinstance(wrapped, list)
        return [w.b_val for w in wrapped]
      else:
        if wrapped is None:
          return [None]
        assert isinstance(wrapped, _BaseValue)
        return [wrapped.b_val]
docs: Like _get_base_value(), but always returns a list.
  
      Returns:
        A new list of unwrapped base values.  For an unrepeated
        property, if the value is missing or None, returns [None]; for a
        repeated property, if the original value is missing or None or
        empty, returns [].