Kobra, Thank you, is there a way now for that not to show up in the Shopping cart?

Lets say client selects Rim Size 15" - 205/55/15
and nothing for Rim Size 16" - None

Both of those entries will show up in the shopping cart

Rim Size 15" - 205/55/15
Rim Size 16" - None

What do I need to change so only
Rim Size 15" - 205/55/15
shows up during checkout?