Show category when an xblock does not have a default display name

cms/djangoapps/contentstore/views/component.py

@@ -372,7 +372,7 @@ def get_component_templates(course):
             if category in ADVANCED_COMPONENT_TYPES and not category in categories:
                 # boilerplates not supported for advanced components
                 try:
-                    component_display_name = get_component_display_name(category)
+                    component_display_name = get_component_display_name(category, default_display_name=category)
                     advanced_component_templates['templates'].append(
                         create_template_dict(
                             component_display_name,

cms/djangoapps/contentstore/views/tests/test_item.py

@@ -1114,6 +1114,15 @@ class TestComponentTemplates(CourseTestCase):
         self.assertNotEqual(only_template.get('category'), 'video')
         self.assertNotEqual(only_template.get('category'), 'openassessment')
 
+    def test_advanced_components_without_display_name(self):
+        """
+        Test that advanced components without display names display their category instead.
+        """
+        self.course.advanced_modules.append('graphical_slider_tool')
+        self.templates = get_component_templates(self.course)
+        template = self.get_templates_of_type('advanced')[0]
+        self.assertEqual(template.get('display_name'), 'graphical_slider_tool')
+
     def test_advanced_problems(self):
         """
         Test the handling of advanced problem templates.