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解决用户还没有点击更新，就去动mDownloadBinder，导致的空指针bug by Jiiiiiin · Pull Request #68 · WVector/AppUpdate

昨天修出了一个bug，不好意思，麻烦再帮忙合并一下：
解决下面的空指针，昨天太晚了，只盯着那个问题测试了。

04-07 16:16:30.942 28268-28268/com.csii.mobilebank E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.csii.mobilebank, PID: 28268
    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.vector.update_app.service.DownloadService$DownloadBinder.stop(java.lang.String)' on a null object reference
        at com.vector.update_app.UpdateDialogFragment.cancelDownloadService(UpdateDialogFragment.java:314)
        at com.vector.update_app.UpdateDialogFragment.onClick(UpdateDialogFragment.java:301)
        at android.view.View.performClick(View.java:6291)
        at android.view.View$PerformClick.run(View.java:24931)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:101)
        at android.os.Looper.loop(Looper.java:166)
        at android.app.ActivityThread.main(ActivityThread.java:7406)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:926)