CDetailView.nullDisplay changing colour if not default value?

Hi there,

If you use CDetailView with nullDisplay property not set (i.e. default value), it will be printed out (localized version) as dimmed (grey) text. But if you set it to any other value than default one, it will be printed with normal (black) text colour. Is this a bug or should it be like that? I would personally prefer version where this text is always printed out in gray / dimmed colour, no matter what value it displays.

Of course, I can do this with CSS. But I’m asking just to feed my curiosity, if this is a bug or planned feature?