Backbone section: don't save name on validation error

cms/static/coffee/spec/views/section_spec.coffee

@@ -74,3 +74,10 @@ describe "CMS.Views.SectionEdit", ->
             expect(@view.showInvalidMessage).toHaveBeenCalledWith(
                 jasmine.any(Object), "BLARRGH", jasmine.any(Object))
             expect(@view.switchToShowView).not.toHaveBeenCalled()
+
+        it "should not save when validation is unsuccessful", ->
+            spyOn(@model, 'validate').andReturn("BLARRGH")
+            @view.$("input[type=text]").val("changed")
+            @view.$("input[type=submit]").click()
+            expect(@model.get('name')).not.toEqual("changed")
+

cms/static/js/views/section.js

@@ -68,6 +68,7 @@ CMS.Views.SectionEdit = Backbone.View.extend({
         this.showView.render();
     },
     showInvalidMessage: function(model, error, options) {
+        model.set("name", model.previous("name"));
         var that = this;
         var msg = new CMS.Models.ErrorMessage({
             title: gettext("Your change could not be saved"),