Prevent linebreaking from crashing on empty containers. (mathjax/MathJax#3232) #1093
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This PR fixes a problem in the LinebreakVisitor object where
malignmarkormaligngroupelements (which have no children) cause a "Math output error" due to an attempt to usechildNodes[0]when that is null.Resolves issue mathjax/MathJax#3232.