if PageContent@findChapterIndex fails to find chapterUUID, allow to return -1. In that case, no action is taken in setting an active chapter, which allows cover page to be displayed. If there is no cover page, the active chapter is already 0 by default.
if PageContent@findChapterIndex fails to find chapterUUID, allow to return -1. In that case, no action is taken in setting an active chapter, which allows cover page to be displayed. If there is no cover page, the active chapter is already 0 by default.