[Orgmode] orgstruct-mode bug: cannot sort region if next line is not a structure element

[Robin Green]

In orgstruct-mode, if you have these three lines:

* TODO in a simulation, it will fail with "Future mempty: it'll never happen, 
buddy" if there is no ResetCmd :FIXME:
* DONE outputs simultaneous with a ResetCmd, *and* the ResetCmds themselves, 
might be dropped :FIXME:
-}

and you select the first two lines with the mouse, so that the cursor
(point?) is at the start of the third line, and then press C-c ^ to
sort them, orgstruct-mode complains that "this key has no function
outside structure elements".

This is with the org-mode included in emacs 23.1.