get_chapters should die if it isn't given a book
get_chapters should die if it isn't given a book

danielhjames/Booktype,kronoscode/Booktype,sourcefabric/Booktype,okffi/booktype,danielhjames/Booktype,btat/Booktype,eos87/Booktype,btat/Booktype,okffi/booktype,kronoscode/Booktype,rob-hills/Booktype,rob-hills/Booktype,eos87/Booktype,rob-hills/Booktype,kronoscode/Booktype,sourcefabric/Booktype,btat/Booktype,olegpshenichniy/Booktype,aerkalov/Booktype,okffi/booktype,eos87/Booktype,okffi/booktype,danielhjames/Booktype,btat/Booktype,aerkalov/Booktype,sourcefabric/Booktype,rob-hills/Booktype,MiczFlor/Booktype,kronoscode/Booktype,olegpshenichniy/Booktype,eos87/Booktype,ride90/Booktype,MiczFlor/Booktype,MiczFlor/Booktype,danielhjames/Booktype,sourcefabric/Booktype,eos87/Booktype,sourcefabric/Booktype,ride90/Booktype,MiczFlor/Booktype,olegpshenichniy/Booktype,ride90/Booktype,ride90/Booktype,okffi/booktype,ride90/Booktype,kronoscode/Booktype,olegpshenichniy/Booktype,aerkalov/Booktype,olegpshenichniy/Booktype,danielhjames/Booktype,MiczFlor/Booktype