Selecting no subscribers does not generate subscribers automatically

[newearthmartin]

There is a line in the admin when selecting subscribers for a submission that says:

If you select none, the system will automatically find the subscribers for you.

One would assume that the above statement means that if you select no subscribers then it would send it to all subscribers of that list. But if I select 0 subscribers, the email gets sent to 0 people. Does this work when creating the Submission from scratch but not when the Submission is already created?