Comment 4 for bug 1386824

Reviewed: https://review.openstack.org/134251
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=13435988905df7de2d804ba2201ec08f13f61de6
Submitter: Jenkins
Branch: master

commit 13435988905df7de2d804ba2201ec08f13f61de6
Author: Peter Razumovsky <email address hidden>
Date: Thu Nov 13 18:31:46 2014 +0300

    Add Dimensions Default in AWS_CloudWatch_Alarm.yaml

    Relying on [1], property Dimensions isn't required, but
    this template has no Default value for Dimensions
    (thereby making it required). This patch fix that omission.
    Besides that, parameters have wrong parsing, because if
    parameter with type 'CommaDelimitedList' has default
    value '', parameter's parsing result would be [u''] instead
    of []. this is wrong, so this patch fix it.

    [1] http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cw-alarm.html

    Change-Id: I259249659c8b5dc846432f8e08985b148b30d682
    Closes-bug: #1386824