CSS get None when error in inline_editing

[Jason Pan]

Like bugs #1470594

But this time it show up when the inline editor error occur.

GET http://172.22.2.24/static/dashboard/scss/None 404 (NOT FOUND)
jQuery.extend.style @ 6b862e7eeeb9.js:449
(anonymous function) @ 6b862e7eeeb9.js:627
jQuery.extend.access @ 6b862e7eeeb9.js:47
jQuery.each.jQuery.each.jQuery.fn.(anonymous function) @ 6b862e7eeeb9.js:625
self.update.horizon.ajax.queue.error @ c5b1a3ff77e6.js:3180
jQuery.Callbacks.fire @ 6b862e7eeeb9.js:187
jQuery.Callbacks.self.fireWith @ 6b862e7eeeb9.js:192
done @ 6b862e7eeeb9.js:524
jQuery.ajaxTransport.s.send.callback @ 6b862e7eeeb9.js:560

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/207313
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=af6bddcb2ac27e02e2eb2eacfaeca9e442a8b87b
Submitter: Jenkins
Branch: master

commit af6bddcb2ac27e02e2eb2eacfaeca9e442a8b87b
Author: Eric Yang <email address hidden>
Date: Thu Jul 30 14:16:34 2015 +0800

    CSS get None when error in inline_editing

    I modify status-icon.
    Because the $icons is None.
    But this line 'background-image: url($icons);' will have 404.
    So let it to this line '@if $icons != None { background-image: url($icons); }'.

    Closes-Bug: #1479637

    Change-Id: I47000c80653f051fb27fb6430fe191d9b449ee42