I'm trying to scrape a set of web pages with the new rvest package. It works for most of the web pages but when there are no tabular entries for a particular letter, an error is returned. I'm trying to scrape a set of web pages with th
阅读背景：
rvest错误：“类中的错误（out）< - ”XMLNodeSet“：尝试在NULL上设置属性”
来源：互联网
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