[racket] lex-error report while reading HTML using module XML

Hi,

In HTML the <img> tag has no end tag. This causes trouble while using
string->xexpr. It is reported that tag img is not closed.

I found in the XML writer there is a parameter named empty-tag-shorthand to
control the HTML generation behavior. So I added a quick hack into XML
reader to tolerate those empty-tags.

Should I commit my patch back to collection?

Regards,
Haiwei
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