DescribeStacks fails if no stack specified

[Zane Bitter]

According to http://docs.amazonwebservices.com/AWSCloudFormation/latest/APIReference/API_DescribeStacks.html the StackName is not a required parameter to DescribeStacks, and if it is not present the description for all stacks should be returned.

This used to work, but since the commit https://github.com/openstack/heat/commit/e848c080790996e85fbbe0080e50b51d9deab46c we now get:

    $ heat-cfn describe
    ERROR:Failed to describe. Got error:
    ERROR:Data supplied was not valid: <ErrorResponse><Error><Message>A bad or out-of-range value was supplied:No stack_identity provided</Message <Code>InvalidParameterValue</Code><Type>Sender</Type></Error></ErrorResponse>

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/18423

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/18423
Committed: http://github.com/openstack/heat/commit/8936c971722b80c5c39bd689774fece7506aeb29
Submitter: Jenkins
Branch: master

commit 8936c971722b80c5c39bd689774fece7506aeb29
Author: Zane Bitter <email address hidden>
Date: Wed Dec 19 18:48:26 2012 +0100

    Fix DescribeStacks command for all stacks

    Fixes: bug 1092196

    Change-Id: I05065c08b4072a9c179ebfb36fb15f062de3f06e
    Signed-off-by: Zane Bitter <email address hidden>