So then the question becomes...are they really "blank"?
It's possible that they're something else, like maybe a null char. I'm not too sure about how default values work, but that has gotten me a couple times when I assumed a field would be the empty string when it was in fact null..
Maybe you can use
if IsNull(row_description)
instead and see if it works.
EDIT: I mean group header.
Edited by Keikoku - 20 Dec 2010 at 9:26am