Merge pull request #1678 from mulby/gabe/fix-cms-course-id-tracking

fix spammy log messages from course_id tracking in CMS

common/djangoapps/track/contexts.py

@@ -43,6 +43,8 @@ def course_context_from_course_id(course_id):
         'course_id': course_id,
         'org_id': ''
     }
+
+    if course_id:
         try:
             location = CourseDescriptor.id_to_location(course_id)
             context['org_id'] = location.org