cannot create notebook in offline mode if mathjax not installed

[satra]

when run in offline mode without running install_mathjax, creating a new notebook simply gives a blank page.

[minrk]

Should be straightforward to simply allow MathJax to be None. If I'm wrong about that, an informative error about the install_mathjax() for offline use would be helpful.

[Carreau]

I came across the same issue, i've made a small patch here:
https://github.com/Carreau/ipython/tree/matjax-warning
But I don't know how to link a pull-request to an issue... shoul'd I open a PR ?

I've put the error message in the notebook.html template, and removed it at body's "onload" if window.MathJax exist.
Note that i've tried to do it on mathjax's "onload" , but it sometime failed because it doesn't find the

to hide...

[minrk]

Sure, open a PR. Just mention the issue by #, and GitHub magic will link it up, e.g. #744. If you add closes #744 to your commit message, then it will be automatically closed at merge.