Domain wizard: should not be able to edit domain members as long as we did not create the domain

When creating a new OpenShift domain, if I click "Edit domain members" with the domain name left blank, I get the following error:
https://www.evernote.com/shard/s230/sh/ce9003cb-7988-4cdd-a4bc-52b04b912378/1e6fcc089fa610043e1d67f516ab68b9

This error is not helpful - and it appears the real problem is that to edit domain members I must create the domain first.

Suggest that we change the create domain dialog to do the following:

1. Enter domain name (this is all that is shown on the dialog. (Mockup attached )
2. Domain is created. Validation message shown on dialog header. The screen changes to show non-editable name and the ability to edit domain members. (Mockup attached)

Not sure if there was a reason we didn't add ability to edit the domain members directly here rather than kicking the user back into the openshift web console.