if there are no bookmars, use the entire width of the app window for tabs
if there are no bookmars, use the entire width of the app window for tabs

pmacMaps/shortlist-storytelling-template-js,anarosner/storymap-shortlist-case-studies,regan-sarwas/shortlist-storytelling-template-js,regan-sarwas/shortlist-storytelling-template-js,Esri/shortlist-storytelling-template-js,anarosner/storymap-shortlist-case-studies,pmacMaps/shortlist-storytelling-template-js,Esri/shortlist-storytelling-template-js