[ENH] Directories w/out subdirectories appear as such in FileList2

Thu Dec 5 22:35:55 UTC 2002

from preamble:

"Change Set:		FileListEmptyDirectoryFix
Date:			5 December 2002
Author:			Steven Swerling

Currently in the hierarchy list FileList2, all folders have toggles that
make them appear to have subfolders. This changeset removes the toggle
from folders that do not contain subfolders. The old behavior of
assuming that a subfolder exists is maintained in cases that would incur
a performance hit (such as nonlocal directories)"!
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