grunt

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js/dist/scrollspy.js

@@ -135,6 +135,7 @@ var ScrollSpy = (function ($) {
             // todo (fat): remove sketch reliance on jQuery position/offset
             return [$(target)[offsetMethod]().top + offsetBase, targetSelector];
           }
+          return null;
         }).filter(function (item) {
           return item;
         }).sort(function (a, b) {