null scrollbar fix for componentWillUnmount #20
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In some cases, `componentWillUnmount` is called before `componentDidMount`, which leaves `this.scrollbar` as null and causes a `Cannot read property 'destroy' of null` error. [See this issue in React](facebook/react#5719)
This is the same change as the one in src/index.jsx: https://github.com/vdh/react-gemini-scrollbar/blob/patch-1/src/index.jsx#L40
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In some cases,
componentWillUnmountis called beforecomponentDidMount, which leavesthis.scrollbaras null and causes aCannot read property 'destroy' of nullerror. See this issue in React