#205075 report by ktabuer, patch by myself, testing by ktauber and Lynn: book block throws notice when used on non-book-node page (with a little bit of code cleanup)
#205075 report by ktabuer, patch by myself, testing by ktauber and Lynn: book block throws notice when used on non-book-node page (with a little bit of code cleanup)

edutrul/social-web,OccupyWallStreet/streetnet,edutrul/social-web,brainhell/drupalglass,edutrul/social-web,joshkoenig/golden-god-demo,OccupyWallStreet/streetnet,edutrul/social-web,rmcveigh/frontend-dev,brainhell/drupalglass,brainhell/drupalglass,lincgr/Prueba,joshkoenig/golden-god-demo,lincgr/Prueba,joshkoenig/golden-god-demo,lincgr/Prueba,rmcveigh/frontend-dev,rmcveigh/frontend-dev,OccupyWallStreet/streetnet,brainhell/drupalglass,edutrul/social-web,joshkoenig/golden-god-demo,OccupyWallStreet/streetnet,joshkoenig/golden-god-demo,lincgr/Prueba,joshkoenig/golden-god-demo,brainhell/drupalglass,joshkoenig/golden-god-demo