Don't add duplicate xmlns entry if original is blank.

mathjax / MathJax-a11y

MathJax Accessibility extensions

https://mathjax.github.io/MathJax-a11y/

Apache License 2.0

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Closed dpvc closed 6 years ago

dpvc commented 7 years ago

Don't add duplicate xmlns entry if original exists but is blank. This prevents SRE from crashing due to duplicate attributes.

Resolves issue #220.