Merge pull request #5820 from rocha/dont-raise-error-on-course-export-command-cleanup

Ignore errors during cleanup of course export command.

lms/djangoapps/courseware/management/commands/export_course.py

@@ -72,7 +72,7 @@ def export_course_to_tarfile(course_key, filename):
         course_dir = export_course_to_directory(course_key, tmp_dir)
         compress_directory(course_dir, filename)
     finally:
-        shutil.rmtree(tmp_dir)
+        shutil.rmtree(tmp_dir, ignore_errors=True)
 
 
 def export_course_to_directory(course_key, root_dir):