no warning message for empty username with inline user edit

[Sergei Chipiga]

Environment:
- upstream
- Chrome, Firefox

Steps:
- Login as admin
- Go to "Identity" -> "Users"
- Move cursor to username and click icon "edit"
- Clear username field and click icon "save"

Expected result:
- Warning message that username can't be empty

Actual result:
- No notifications. Just username is still in edit mode

[Gregory Hooks (gregoryhooksjr)]

https://review.openstack.org/#/c/306675/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/306675
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=af0d4dab7810e410560b1854ebf8db1188dab2e6
Submitter: Jenkins
Branch: master

commit af0d4dab7810e410560b1854ebf8db1188dab2e6
Author: Gregory Hooks <email address hidden>
Date: Sat Apr 16 01:34:13 2016 +0000

    Added a warning message if User Name is empty

    Adding required=False to the user name form allows it to call
    update_cell when it has been left empty. I added logic to update_cell
    to check if the form is empty or contains only whitespace and issue a
    warning if true and only if the form in question is called 'name'.

    Change-Id: Ieccb3f6d7be1acb4b7734e68d467a40cfc7eb99c
    Closes-Bug: 1567398

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/horizon 10.0.0.0b1 development milestone.