preventing errors from indexOf() on undefined
preventing errors from indexOf() on undefined

bkimminich/juice-shop,bkimminich/juice-shop,bonze/juice-shop,m4l1c3/juice-shop,m4l1c3/juice-shop,m4l1c3/juice-shop,oviroman/disertatieiap2017,oviroman/disertatieiap2017,oviroman/disertatieiap2017,bkimminich/juice-shop,m4l1c3/juice-shop,oviroman/disertatieiap2017,bonze/juice-shop,bonze/juice-shop,bonze/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,bonze/juice-shop,oviroman/disertatieiap2017,bkimminich/juice-shop,m4l1c3/juice-shop