Fix LaTeXML rendering

[physikerwelt]

Describe the bug

Expected behavior Formula shown

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

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[physikerwelt]

@timconrad I created a patch https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Math/+/1037890 and temporary deployed it. Can you cross-check please? (You might want to add ?action=purge

[physikerwelt]

It has been reviewed and will end up in the master branch shortly

https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Math/+/1037890