Unit page doesn't load when mathjax is down

When mathjax is down studio page doesn't work as
it wait for mathjax to load. I replaced the hard
dependency with soft dependency now unit page can
load with mathjax.

cms/static/build.js

@@ -89,7 +89,7 @@
         shim: {
             'xmodule': {
                 deps: [
-                    'jquery', 'underscore', 'mathjax', 'codemirror', 'tinymce',
+                    'jquery', 'underscore', 'codemirror', 'tinymce',
                     'jquery.tinymce', 'jquery.qtip', 'jquery.scrollTo', 'jquery.flot',
                     'jquery.cookie', 'utility'
                 ]

common/djangoapps/pipeline_js/templates/xmodule.js

@@ -4,21 +4,20 @@
 ## These files assume that several libraries are available and bound to
 ## variables in the global context, so we load those libraries with requirejs
 ## and attach them to the global context manually.
-define(["jquery", "underscore", "mathjax", "codemirror", "tinymce",
+define(["jquery", "underscore", "codemirror", "tinymce",
         "jquery.tinymce", "jquery.qtip", "jquery.scrollTo", "jquery.flot",
         "jquery.cookie",
         "utility"],
-       function($, _, MathJax, CodeMirror, tinymce) {
+       function($, _, CodeMirror, tinymce) {
     window.$ = $;
     window._ = _;
-    window.MathJax = MathJax;
+    require(['mathjax']);
     window.CodeMirror = CodeMirror;
     window.RequireJS = {
         'requirejs': requirejs,
         'require': require,
         'define': define
     };
-
     /**
      * Loads all modules one-by-one in exact order.
      * The module should be used until we'll use RequireJS for XModules.