upgrade backbone-associations, fix tests

Merge pull request #17559 from edx/ri/EDUCATOR-2231-remove-enrollment-dates-references

EDUCATOR-2231 remove course run enrollment dates references from studio

add NoTextbooks component

make backbone-associations work

webpackify context course

test fixup

cms/static/js/features_jsx/studio/NoTextbooks.jsx

@@ -0,0 +1,24 @@
+/* global gettext */
+
+import PropTypes from 'prop-types';
+import React from 'react';
+
+export class NoTextbooks extends React.Component {
+  render() {
+    return (
+      <div className="no-textbook-content">
+        <p>
+          {gettext("You haven't added any textbooks to this course yet.")}
+          <a href="#" className="button new-button">
+            <span className="icon fa fa-plus" aria-hidden="true"></span>
+            {gettext("Add your first textbook")}
+          </a>
+        </p>
+      </div>
+    );
+  }
+}
+
+NoTextbooks.propTypes = {
+
+};

cms/static/js/pages/course.js

@@ -0,0 +1,6 @@
+define(
+        ['js/models/course'],
+        function(ContextCourse) {
+            window.course = new ContextCourse(window.pageFactoryArguments.ContextCourse[0]);
+        }
+    );

cms/static/js/pages/textbooks.js

@@ -0,0 +1,7 @@
+define(
+    ['js/factories/textbooks', 'common/js/utils/page_factory', 'js/pages/course'],
+    function(TextbooksFactory, invokePageFactory) {
+        'use strict';
+        invokePageFactory('TextbooksFactory', TextbooksFactory);
+    }
+);