From 085f54a4ca057d466786cfee193c1a38aa2b172c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <elemoine@mirantis.com>
Date: Fri, 12 Feb 2016 10:03:06 +0100
Subject: [PATCH] Fix kolla_docker check_volume

This commit fixes a bug in kolla_checker.py where the check_volume
function will raise "TypeError NoneType object is not iterable" if
there are no existing volumes.

TrivialFix

Change-Id: Ic57c339793fa532ed8db075ba1074db75106e36d
---
 ansible/library/kolla_docker.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ansible/library/kolla_docker.py b/ansible/library/kolla_docker.py
index 705fc939b7..f095c4db8e 100644
--- a/ansible/library/kolla_docker.py
+++ b/ansible/library/kolla_docker.py
@@ -220,7 +220,7 @@ class DockerWorker(object):
                     return image
 
     def check_volume(self):
-        for vol in self.dc.volumes()['Volumes']:
+        for vol in self.dc.volumes()['Volumes'] or list():
             if vol['Name'] == self.params.get('name'):
                 return vol