[tokenizer] fixed handling non-existent entities
[tokenizer] fixed handling non-existent entities

kirbysayshi/node-htmlparser,broadly/htmlparser2,broadly/htmlparser2,jasonsanjose/htmlparser2,magicode/htmlparser2,jasonsanjose/htmlparser2,fasterize/node-htmlparser,magicode/htmlparser2,mail-apps/htmlparser2,mail-apps/htmlparser2,frontapp/htmlparser2,frontapp/htmlparser2