Displaying only sub-categories with products

Hi,

I am in the process of setting-up a wine store. My categories are: Ratings, subcategories: countries. So, for all rating categories I have 8 sub-cat with the respective countries. However, I do not have from all 8 countries wines with a certain rating (e.g. I only have 100 point wines from France, Spain and Italy, but not from Germany and the USA). I wonder whether it would be possible to suppress showing the sub-cats without having wines in. So, when clicking on 100 points, it should only show the 3 countries mentioned above, when clicking on 90 points it probably would show all.

One solution obviously would be to do it manually, i.e. to disable the sub-cats without sines in it. But the big risk here is that I miss would miss to do the change when I add products or products sold out.

Is it possible to do it automatically?