My AJ has double "white" haws, and he's "plain", which is sometimes considered a weird combination. While he's not finished, he would have been had I not retired him. He was 3 pts from finishing.
As previously pointed out, unpigmented haws are a fault, not a disqualification, so the extent of how much your dog is penalized depends on the judge and how much they value that particular cosmetic feature. Some judges penalize heavily, some don't penalize at all. It's all very subjective, and won't hinder you if the specimen you are showing is in many other aspect a good representative of the breed.
If you want to see pictures of AJ, there are in-ring movement shots and a head shots (where you can easily see he is double white) in my gallery.