use the fact that empty sequences are false for sequences(lists,strings,tuples)

[shu, xinxin]

for sequences, use the fact that empty sequences are false

Yes: if not seq:
     if seq:

No: if len(seq)
    if not len(seq)

[Brian Waldon (bcwaldon)]

There may be some places where this change is ok, but this is functionally different code.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/23145

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/23145
Committed: http://github.com/openstack/glance/commit/0f2d8d4d7c83829a1e78150cbe946068080f9631
Submitter: Jenkins
Branch: master

commit 0f2d8d4d7c83829a1e78150cbe946068080f9631
Author: shu,xinxin <email address hidden>
Date: Fri Feb 16 03:25:45 2001 +0800

    fixes use the fact that empty sequences are false

    fixed bug #1133094

    Change-Id: Ie0514be1cb0ed6741f96334f7457da331f0eebc9