I've reviewed the posts on www.bytes.com.
My problem is the same as that reported by others:
a report with an empty subreport cannot suppress the display of the empty subreport. I've set the "can shrink" and "can grow" properties to "yes" on both the footer and the subreport's control object. I've also minimized the physical size of the subreport in the footer. These all seem to make no difference. So,...