Include stack trace in Course Rerun errors; Log errors.

cms/djangoapps/contentstore/tasks.py

@@ -5,6 +5,7 @@ This file contains celery tasks for contentstore views
 from celery.task import task
 from django.contrib.auth.models import User
 import json
+import logging
 from xmodule.modulestore.django import modulestore
 from xmodule.course_module import CourseFields
 
@@ -40,13 +41,15 @@ def rerun_course(source_course_key_string, destination_course_key_string, user_i
 
     except DuplicateCourseError as exc:
         # do NOT delete the original course, only update the status
-        CourseRerunState.objects.failed(course_key=destination_course_key, exception=exc)
+        CourseRerunState.objects.failed(course_key=destination_course_key)
+        logging.exception(u'Course Rerun Error')
         return "duplicate course"
 
     # catch all exceptions so we can update the state and properly cleanup the course.
     except Exception as exc:  # pylint: disable=broad-except
         # update state: Failed
-        CourseRerunState.objects.failed(course_key=destination_course_key, exception=exc)
+        CourseRerunState.objects.failed(course_key=destination_course_key)
+        logging.exception(u'Course Rerun Error')
 
         try:
             # cleanup any remnants of the course