[Image Based] Stack creation failed with ValueError: Key cannot be the null string

custom ISO with image based provisioning
{

    "build_id": "2014-10-31_17-59-08",
    "ostf_sha": "9c6fadca272427bb933bc459e14bb1bad7f614aa",
    "build_number": "363",
    "auth_required": true,
    "api": "1.0",
    "nailgun_sha": "53aad9234729e2a4ab3238a8ac5442b1df766256",
    "production": "docker",
    "fuelmain_sha": "6f16a7e84854dbb87b74c2c75653df41cd593549",
    "astute_sha": "c72dac7b31646fbedbfc56a2a87676c6d5713fcf",
    "feature_groups": [
        "mirantis"
    ],
    "release": "6.0",
    "release_versions": {
        "2014.2-6.0": {
            "VERSION": {
                "build_id": "2014-10-31_17-59-08",
                "ostf_sha": "9c6fadca272427bb933bc459e14bb1bad7f614aa",
                "build_number": "363",
                "api": "1.0",
                "nailgun_sha": "53aad9234729e2a4ab3238a8ac5442b1df766256",
                "production": "docker",
                "fuelmain_sha": "6f16a7e84854dbb87b74c2c75653df41cd593549",
                "astute_sha": "c72dac7b31646fbedbfc56a2a87676c6d5713fcf",
                "feature_groups": [
                    "mirantis"
                ],
                "release": "6.0",
                "fuellib_sha": "fdb5a3d4a230fee3cc0abff4ff8bf0ebc3d7bc72"
            }
        }
    },
    "fuellib_sha": "fdb5a3d4a230fee3cc0abff4ff8bf0ebc3d7bc72"

}

Steps:
1. Create next cluster - Ubuntu, HA, Flat Nova network, Ceph for volumes and for images, 3 controllers, 2 compute, 2 ceph nodes
2. Deploy cluster
3. After successful deployment log in to controller
4. Try to create stack with heat
heat --debug stack-create mystack --template-file heat_create_nova_stack_template.yaml --parameters "InstanceType=m1.tiny" --parameters "ImageId=72ed520f-540f-46d7-bd3a-42b118eaacb1"

Expected - stack is created
Actual - creation failed with
DEBUG (session) REQ: curl -i -X GET http://10.108.2.2:5000/v2.0/ -H "Accept: application/json" -H "User-Agent: python-keystoneclient"
DEBUG (session) RESP: [200] CaseInsensitiveDict({'date': 'Tue, 04 Nov 2014 12:15:03 GMT', 'vary': 'X-Auth-Token', 'content-length': '420', 'content-type': 'application/json'})
RESP BODY: {"version": {"status": "stable", "updated": "2014-04-17T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v2.0+json"}, {"base": "application/xml", "type": "application/vnd.openstack.identity-v2.0+xml"}], "id": "v2.0", "links": [{"href": "http://10.108.2.2:5000/v2.0/", "rel": "self"}, {"href": "http://docs.openstack.org/", "type": "text/html", "rel": "describedby"}]}}

DEBUG (v2) Making authentication request to http://10.108.2.2:5000/v2.0/tokens
DEBUG (session) REQ: curl -i -X POST http://10.108.1.2:8004/v1/547e8db9ea854a4d974fff99dc82df2d/stacks -H "Accept: application/json" -H "X-Auth-Token: TOKEN_REDACTED" -H "X-Region-Name: RegionOne" -H "X-Auth-Key: admin" -H "X-Auth-User: admin" -H "User-Agent: python-heatclient" -H "Content-Type: application/json" -H "X-Auth-Url: http://10.108.2.2:5000/v2.0/" -d '{"files": {}, "disable_rollback": true, "parameters": {"InstanceType": "m1.tiny", "ImageId": "72ed520f-540f-46d7-bd3a-42b118eaacb1"}, "stack_name": "mystack12", "environment": {}, "template": {"heat_template_version": "2013-05-23", "description": "Template which creates single instance\n", "parameters": {"InstanceType": {"type": "string"}, "ImageId": {"type": "string"}}, "resources": {"Server": {"type": "OS::Nova::Server", "properties": {"image": {"get_param": "ImageId"}, "flavor": {"get_param": "InstanceType"}}, "metadata": {"Name": "ost1-test_heat"}}}}}'
DEBUG (session) RESP:
Traceback (most recent call last):
  File "/usr/bin/heat", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/dist-packages/heatclient/shell.py", line 656, in main
    HeatShell().main(args)
  File "/usr/lib/python2.7/dist-packages/heatclient/shell.py", line 606, in main
    args.func(client, args)
  File "/usr/lib/python2.7/dist-packages/heatclient/v1/shell.py", line 114, in do_stack_create
    hc.stacks.create(**fields)
  File "/usr/lib/python2.7/dist-packages/heatclient/v1/stacks.py", line 119, in create
    data=kwargs, headers=headers)
  File "/usr/lib/python2.7/dist-packages/heatclient/common/http.py", line 254, in json_request
    resp = self._http_request(url, method, **kwargs)
  File "/usr/lib/python2.7/dist-packages/heatclient/common/http.py", line 344, in _http_request
    raise exc.from_response(resp)
heatclient.exc.HTTPBadRequest: ERROR: Key cannot be the null string
Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 137, in _dispatch_and_reply
    incoming.message))

  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 180, in _dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)

  File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 126, in _do_dispatch
    result = getattr(endpoint, method)(ctxt, **new_args)

  File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", line 69, in wrapped
    return func(self, ctx, *args, **kwargs)

  File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", line 624, in create_stack
    stack.store()

  File "/usr/lib/python2.7/dist-packages/heat/engine/stack.py", line 318, in store
    new_creds = db_api.user_creds_create(self.context)

  File "/usr/lib/python2.7/dist-packages/heat/db/api.py", line 170, in user_creds_create
    return IMPL.user_creds_create(context)

  File "/usr/lib/python2.7/dist-packages/heat/db/sqlalchemy/api.py", line 476, in user_creds_create
    method, password = _encrypt(values['password'])

  File "/usr/lib/python2.7/dist-packages/heat/db/sqlalchemy/api.py", line 181, in _encrypt
    return crypt.encrypt(value.encode('utf-8'))

  File "/usr/lib/python2.7/dist-packages/heat/common/crypt.py", line 36, in encrypt
    auth_info, b64encode=True)

  File "/usr/lib/python2.7/dist-packages/heat/openstack/common/crypto/utils.py", line 133, in encrypt
    cipher = self.cipher.new(key, self.cipher.MODE_CBC, iv)

  File "/usr/lib/python2.7/dist-packages/Crypto/Cipher/AES.py", line 94, in new
    return AESCipher(key, *args, **kwargs)

  File "/usr/lib/python2.7/dist-packages/Crypto/Cipher/AES.py", line 59, in __init__
    blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs)

  File "/usr/lib/python2.7/dist-packages/Crypto/Cipher/blockalgo.py", line 141, in __init__
    self._cipher = factory.new(key, *args, **kwargs)

ValueError: Key cannot be the null string
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