Merge pull request #723 from MITx/feature/dave/fix_no_topic_forum

Make the default topic a dict so it doesn't error on courses that don't ...

lms/djangoapps/django_comment_client/utils.py

@@ -189,7 +189,7 @@ def initialize_discussion_info(course):
                                                       "sort_key": entry["sort_key"],
                                                       "start_date": entry["start_date"]}
 
-    default_topics = {'General': course.location.html_id()}
+    default_topics = {'General': {'id' :course.location.html_id()}}
     discussion_topics = course.metadata.get('discussion_topics', default_topics)
     for topic, entry in discussion_topics.items():
         category_map['entries'][topic] = {"id": entry["id"],