If you mentioned in your profile before you receive your ITA, that your spouse has done education, that means that you want to get points for it, meaning of course needs WES evaluation.
Otherwise, you should leave it blank. and then it wouldn't ask you to upload anything for spouse.
Now if you are in that position, you have two options:
1. If your score too high, decline ITA, fix profile, then accept next draw.
2. Upload degrees with explanation letter saying that you are not claiming points for this.
I am with option 2.
Good luck.