A little shortcoming in catalog search
Please see the ReM, p. 117, footnote 32, last paragraph:
If a character or sequence specified is not found then the first item following alphabetically will be shown – see the sorting order in the IOI. If there is no such item, then the last item in this catalog will be displayed.
(Emphasis added.) This doesn't work as expected - an empty menu section is displayed instead. Tested with #.