Alex Vandiver b02754adec html_diff: Handle empty differences between empty strings. ...

`rendered_content` in historical messages may be empty; examining the
history of them may thus require diff'ing two empty strings, which
itself produces an empty string.

Use `lxml.html.fragment_fromstring` to be able to successfully parse
these, rather than 500.

Part of #19559.

2021-10-18 18:27:40 -07:00

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