Nothing is displayed if volume metadata is empty

[Akihiro Motoki]

If volume metadata is empty, nothing is displayed below "Metadata" <h4> heading in the volume detail page.
It is clearer and nice if "None" is displayed for such case.

 Metadata
    None

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/130140

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/130140
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=00e9dc6b888251cf48a45ef6ccfb0b418aeb6c55
Submitter: Jenkins
Branch: master

commit 00e9dc6b888251cf48a45ef6ccfb0b418aeb6c55
Author: nikunj2512 <email address hidden>
Date: Wed Oct 22 12:33:00 2014 +0530

    Fixes nothing is displayed if volume metadata is empty problem

    If volume metadata is empty, nothing is displayed below "Metadata"
    <h4> heading in the volume detail page. So, this patch fixes this
    problem by displaying "None".

    Change-Id: I0302e47cc8c9e471972ef7c249d54582242b5390
    Closes-bug: #1382876