some job submission messages do not provide output dataset(s)

e.g. flatten_collection on a collection gives you:

```
1 job has been successfully added to the queue - resulting in the following datasets:

You can check the status of queued jobs and view the resulting data by refreshing the History pane. When the job has been run the status will change from 'running' to 'finished' if completed successfully or 'error' if problems were encountered.
```

No file or test is named. Reproduce flatten_collection on a collection and trace where the job-submission message is assembled and displayed in the History pane. Done means the message includes the resulting output dataset(s) for this case without regressing the existing queue and status text.

Written by the indexing model from the issue text.