In the Display Patterns dialogue you want to click the "Allow Zero" box.
If you're version of LC is older, you'll need to manually add [b]zero{}[/b] to your display pattern. If you already have something in the display pattern you need to separate them with a bar [b]|[/b].
If you're version of LC is older, you'll need to manually add [b]zero{}[/b] to your display pattern. If you already have something in the display pattern you need to separate them with a bar [b]|[/b].