Comment 4 for bug 1021810

Reviewed: https://review.openstack.org/9967
Committed: http://github.com/openstack/nova/commit/458a5d61eac5eb5cef34ab301b67fa37271ba407
Submitter: Jenkins
Branch: master

commit 458a5d61eac5eb5cef34ab301b67fa37271ba407
Author: Tong Li <email address hidden>
Date: Wed Jul 18 11:26:12 2012 -0400

    fixes for nova-manage network list if network has been deleted

    this fix addresses the bug #1021810
    Currently command 'nova-manage network list' or
    'nova-manage fixed list' will return 'Command failed.' message when
    there is no network defined or networks get deleted. This fix combined
    with fixes to bug 1025827 will fix both command problem.
    also change the print out message so that it can be translated.
    code structure changes according to the suggestion from comments.

    Change-Id: Id9a1a10217aac971cbbba9db5829c8478892db1a