STUD-1911, STUD-1932: Publish sections, subsections and units from course outline.

cms/static/js/models/xblock_info.js

@@ -59,7 +59,7 @@ function(Backbone, _, str, ModuleUtils) {
              */
             "visibility_state": null,
             /**
-             * True iff the release date of the xblock is in the past.
+             * True if the release date of the xblock is in the past.
              */
             'released_to_students': null,
             /**
@@ -153,6 +153,10 @@ function(Backbone, _, str, ModuleUtils) {
             return childInfo && childInfo.children.length > 0;
         },
 
+        isPublishable: function(){
+            return !this.get('published') || this.get('has_changes');
+        },
+
         /**
          * Return a list of convenience methods to check affiliation to the category.
          * @return {Array}