guarding access to localStorage
guarding access to localStorage

fixes #313

tonsky/lein-figwheel,aJchemist/lein-figwheel,aJchemist/lein-figwheel,tonsky/lein-figwheel,bhauman/lein-figwheel,tonsky/lein-figwheel,bhauman/lein-figwheel,verma/lein-figwheel,verma/lein-figwheel,bhauman/lein-figwheel,aJchemist/lein-figwheel