[Orgmode] folding broken in sparse TODO tree

[Jason Dunsmore]

I think this may be a bug.  When I show a sparse TODO tree with
org-show-todo-tree, 4th level and deeper headings don't unfold
correctly.

If you put this in an empty org-mode buffer:

* level 1
notes
** level 2
notes
*** level 3
notes
**** TODO level 4
notes

Then press C-c C-v, go to the level 4 header, and press Tab, it isn't
unfolded and an "EMPTY ENTRY" message is displayed.  This is with
org-mode 7.75 and GNU Emacs 22.0.97.1.