When closing table cells, get new table pointer.  Resolves issue #1013.
When closing table cells, get new table pointer.  Resolves issue #1013.

GerHobbelt/MathJax,minrk/components-mathjax,perseoq/MathJax,minrk/mathjax-component,nvp2211/MathJax,anueshenxing/MathJax,mcanthony/MathJax,dpvc/MathJax,jeremykenedy/MathJax,jinntrance/mathjax,anueshenxing/MathJax,minrk/components-mathjax,Edraak/MathJax,anusornc/MathJax,nvp2211/MathJax,wikimedia/MathJax,physikerwelt/MathJax,minrk/mathjax-component,cheerfulstoic/MathJax,ManrajGrover/MathJax,jeremykenedy/MathJax,thomasjm/MathJax,cheerfulstoic/MathJax,thomasjm/MathJax,Ivanwangcy/MathJax,thomasjm/MathJax,perseoq/MathJax,jinntrance/mathjax,thomasjm/MathJax,cben/MathJax,cben/MathJax,thomasjm/MathJax,Ivanwangcy/MathJax,anusornc/MathJax,GerHobbelt/MathJax,ManrajGrover/MathJax,mcanthony/MathJax,Edraak/MathJax