Uncaught TypeError: o is undefined #318

Hi!

When using the bookmarklet on https://renardeau.chezsoi.org/, when clicking on "View Report", I get the following error in the developper console:

Uncaught TypeError: o is undefined
    v https://squizlabs.github.io/HTML_CodeSniffer/build/HTMLCS.js:24
    build https://squizlabs.github.io/HTML_CodeSniffer/build/HTMLCS.js:24
    onclick https://squizlabs.github.io/HTML_CodeSniffer/build/HTMLCS.js:24

It seems to come from this code line:
https://github.com/squizlabs/HTML_CodeSniffer/blob/2.5.1/Auditor/HTMLCSAuditor.js#L692

message.msg is seemingly undefined

As a consequence, I cannot consult the report, and sadly this great tool is unusable to me