Commit dc164c6b authored by Yue-Lan's avatar Yue-Lan
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extra preview: add file exist check when unoconv child prog exit.

unoconv子进程可能会被新的unoconv子进程杀死,这会导致发送一个文件实际上不存在的pdf或html预览的回调。
增加一个检测文件是否存在的流程,避免显示一个不存在的文件导致预览界面报错。
parent 210f180e
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