Added display of email when scorer has no first/last name; hid other scores when user's score isn't >0.
Added display of email when scorer has no first/last name; hid other scores when user's score isn't >0.

DjangoGirls/djangogirls,patjouk/djangogirls,patjouk/djangogirls,DjangoGirls/djangogirls,DjangoGirls/djangogirls,patjouk/djangogirls,patjouk/djangogirls