When a project does not have any math directives or roles, still every HTML page has this tag when built with Sphinx 1.8:

<script async="async" type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>

This is unwanted, and did not happen with Sphinx 1.7.

It would be nice if the tag was included only when the page (or the project as a whole) has a math directive or role.