now when the referer is empty 'go_to_previous_page' will generate a 404 which is not perfect but better than an empty page
now when the referer is empty 'go_to_previous_page' will generate a 404 which is not perfect but better than an empty page

tempbottle/cppcms-skeleton,tempbottle/cppcms-skeleton,tempbottle/cppcms-skeleton,tempbottle/cppcms-skeleton,allan-simon/cppcms-skeleton,Tatoeba/cppcms-skeleton,Tatoeba/cppcms-skeleton,Tatoeba/cppcms-skeleton,Tatoeba/cppcms-skeleton,allan-simon/cppcms-skeleton,allan-simon/cppcms-skeleton,allan-simon/cppcms-skeleton