Uploading media file is empty 上传的媒体文件意外丢失
Since the hello world example only has a single page, this file is empty here.
因为hello world示例只有一个简单的页面，因此该文档是空的。
In case of hard or symbolic links to a file, this API checks whether the original file is empty.
对于文件的硬链接或符号链接的情况，此api将检查原始文件是否为空。
The result is that after a crash the file is empty: both the old and the new data have been lost.
这就造成了系统崩溃之后文件变成空的：无论原来的还是新的数据都被丢失了。
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