Admin user add DHCP agent failed when the network name is blank

[qiaomin032]

Reproduce the bug:
1, Login as an "Admin" user, then go to the "Admin"=>"System"=>"Networks" page, then create a network and it's name is network1;
2, Edit network and set it's name is blank, and it will display it's ID as name;
3,Click the name link and go forward to the network's detail page ;
4, Click "Add DHCP Agent" button and open a form modal, select a "New DHCP Agent", then click the submit button, there will display the error "this field is required" beside the "Network Name" field.

But the add DHCp agent api support network having no name. So when open the "Add DHCP Agent" form modal, there should display the network's name_or_id.

 Related bug:https://bugs.launchpad.net/horizon/+bug/1492667

Please see the attachment for more detail.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/222869

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/222869
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=88674d0f3d0fb00c782e6bdc99ff67038a2ef490
Submitter: Jenkins
Branch: master

commit 88674d0f3d0fb00c782e6bdc99ff67038a2ef490
Author: chenqiaomin <[e-mail]>
Date: Fri Jul 10 15:25:12 2015 -0400

    Fix "create failed" bug in add DHCP agent form

    When Add DHCP agent for a network that it's name is blank,
    it cast error "This field is required" beside the network
    name field. So there should display the network's name_or_id
    in "Add DHCP Agent" form modal, and this is consistent with
    the "Edit Network". This patch fix the bug.

    Change-Id: I4ad4b1d9907d7aa521ba6da44be8230aa301fcb2
    Closes-Bug: #1495105