If it's a huge deal, we can get rid of this field. It was added in last-minute because it's possible for a task to have a message of done, but to drop emails. So we added this "status" field to more visually alert course instructors that whilst the task is "done" (according to the `task_message`), emails were dropped and thus the task is "Incomplete".

The `task_message` does have this info but you have to examine and parse (it says something like, "Done. Emailed 150/200 users" - so you have to go, huh what why did it drop 50 users; the success actually indicates whether or not we consider the task a success)