批量删除下载任务时候有时候空指针

[mgxlili]

异常信息：
Thread Name: 'Video_download_state_thread'
Back traces starts.
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.jeffmony.downloader.listener.DownloadListener.onDownloadDefault(com.jeffmony.downloader.model.VideoTaskItem)' on a null object reference
at com.jeffmony.downloader.VideoDownloadManager.handleOnDownloadDefault(SourceFile:1)
at com.jeffmony.downloader.VideoDownloadManager.access$400(SourceFile:1)
at com.jeffmony.downloader.VideoDownloadManager$VideoDownloadHandler.dispatchDownloadMessage(SourceFile:8)
at com.jeffmony.downloader.VideoDownloadManager$VideoDownloadHandler.handleMessage(SourceFile:5)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:226)
at android.os.Looper.loop(Looper.java:313)
at android.os.HandlerThread.run(HandlerThread.java:67)
Back traces ends.

是不是需要在 deleteVideoTask 方法中进行 null判断。类似 pauseDownloadTask处理一样。