Circumvent errors on course load on update_student_tags job

Author: murhum1

feedback/tasks.py

@@ -85,6 +85,9 @@ def update_student_tags(self): # pylint: disable=unused-argument
             continue
         # check if course is still in progress
         course_api = client.load_data(course.url)
+        if course_api == None:
+            logger.warning("Could not load course data for %s.", course)
+            continue
         course_end = datetime.fromisoformat(course_api.get("ending_time"))
         if datetime.now(timezone.utc) < course_end:
             # update tags