Extend shouldBailOut to check for existence of attached DOM element #169
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This extends
shouldBailOutto ensure that the provided DOM element reference is still attached to the DOM, we had a situation where we calledscrollIntoViewon an element that had since been removed which would throwTypeError: undefined is not an object (evaluating 'el.clientHeight') (anonymous function) — smoothscroll.js:117and cause scrolling to break.I believe this should fix #138 and may also resolve #161.