Shop items with no category are not visible in admin area

[denny]

The shop item list page in the admin area groups the items by category. This means that if an item has no categories set then it disappears from the admin view, which is hard to fix without URL munging or sticking your fingers in the database.

Proposed fix; create an 'Uncategorised' pseudo-category at the end of the page and display any such items there.