Raw JSON returned after clicking "Cancel This Instance" button during a send

[cjg89]

This may have been a fluke/oddity due to DSO Prod's DB seemingly being copied over from current-Prod while an email was sending, but when I attempted to cancel the stuck sending instance in DSO Prod by clicking the "cancel this instance" button on the single instance view, I got a raw JSON success message.

We'd need to test a send cancel against a running email send to confirm whether or not this is still happening.

[jmbarne3]

The relevant code: https://github.com/UCF/PostMaster/blob/master/manager/views.py#L483-L510

It looks like the view is setup to work from the dashboard, but not from the single instance view. I believe in the dashboard, some javascript posts to the view to cancel the send, and then the response is processed and puts a message on the screen. We probably need to just add in some additional logic that reloads the instance view with an info message.

I think the issue currently exists in PROD and is not related to the DSO migration. We've just never come across it, probably because all of our cancellations have been done from the dashboard view.