AttributeError: 'unicode' object has no attribute 'get'

novaclient 3.3.1 (stable/mitaka) fails vs nova==12.0.3.dev287 (liberty). As I understand it, new versions should be back-compatible. Do we need a fix to stable/mitaka? novaclient 3.4.0 works OK.

$ nova list --debug
DEBUG (extension:156) found extension EntryPoint.parse('v2token = keystoneauth1.loading._plugins.identity.v2:Token')
DEBUG (extension:156) found extension EntryPoint.parse('admin_token = keystoneauth1.loading._plugins.admin_token:AdminToken')
DEBUG (extension:156) found extension EntryPoint.parse('v3oidcauthcode = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectAuthorizationCode')
DEBUG (extension:156) found extension EntryPoint.parse('v2password = keystoneauth1.loading._plugins.identity.v2:Password')
DEBUG (extension:156) found extension EntryPoint.parse('v3password = keystoneauth1.loading._plugins.identity.v3:Password')
DEBUG (extension:156) found extension EntryPoint.parse('v3oidcpassword = keystoneauth1.loading._plugins.identity.v3:OpenIDConnectPassword')
DEBUG (extension:156) found extension EntryPoint.parse('token = keystoneauth1.loading._plugins.identity.generic:Token')
DEBUG (extension:156) found extension EntryPoint.parse('v3token = keystoneauth1.loading._plugins.identity.v3:Token')
DEBUG (extension:156) found extension EntryPoint.parse('password = keystoneauth1.loading._plugins.identity.generic:Password')
DEBUG (session:248) REQ: curl -g -i --cacert "/etc/ssl/certs/ca-certificates.crt" -X GET https://192.168.245.9:5000/v3 -H "Accept: application/json" -H "User-Agent: keystoneauth1/2.5.0 python-requests/2.9.1 CPython/2.7.9"
INFO (connectionpool:758) Starting new HTTPS connection (1): 192.168.245.9
DEBUG (connectionpool:387) "GET /v3 HTTP/1.1" 200 253
DEBUG (session:277) RESP: [200] Content-Length: 253 Vary: X-Auth-Token Server: Apache/2.4.10 (Debian) Date: Wed, 13 Apr 2016 16:24:35 GMT Content-Type: application/json x-openstack-request-id: req-af84a782-4630-439f-b4f9-c69788d73ece
RESP BODY: {"version": {"status": "stable", "updated": "2015-03-30T00:00:00Z", "media-types": [{"base": "application/json", "type": "application/vnd.openstack.identity-v3+json"}], "id": "v3.4", "links": [{"href": "https://192.168.245.9:5000/v3/", "rel": "self"}]}}

DEBUG (base:165) Making authentication request to https://192.168.245.9:5000/v3/auth/tokens
DEBUG (connectionpool:387) "POST /v3/auth/tokens HTTP/1.1" 201 10092
DEBUG (base:170) {"token": {"methods": ["password"], "roles": [{"id": "af8b746d7f7747c9ad023198335a832a", "name": "monasca-user"}, ... snip ...
DEBUG (session:248) REQ: curl -g -i --cacert "/etc/ssl/certs/ca-certificates.crt" -X GET https://192.168.245.9:8774/v2/e9d146ac820c461b9b48bef1d5ceb2bf -H "User-Agent: python-novaclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}6ed67f7813afsnip7d34c07b1d"
INFO (connectionpool:758) Starting new HTTPS connection (1): 192.168.245.9
DEBUG (connectionpool:387) "GET /v2/e9d146ac820c461b9b48bef1d5ceb2bf HTTP/1.1" 404 112
DEBUG (session:277) RESP: [404] Date: Wed, 13 Apr 2016 16:24:36 GMT Connection: keep-alive Content-Type: application/json; charset=UTF-8 Content-Length: 112 X-Compute-Request-Id: req-2e065490-aa49-4a82-bc59-a7ca38188021
RESP BODY: {"message": "The resource could not be found.<br /><br />\n\n\n", "code": "404 Not Found", "title": "Not Found"}

DEBUG (shell:1082) 'unicode' object has no attribute 'get'
Traceback (most recent call last):
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/shell.py", line 1080, in main
    OpenStackComputeShell().main(argv)
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/shell.py", line 914, in main
    api_version = api_versions.discover_version(self.cs, api_version)
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/api_versions.py", line 267, in discover_version
    client)
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/api_versions.py", line 248, in _get_server_version_range
    version = client.versions.get_current()
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/v2/versions.py", line 84, in get_current
    return self._get_current()
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/v2/versions.py", line 57, in _get_current
    return self._get(url, "version")
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/base.py", line 339, in _get
    resp, body = self.api.client.get(url)
  File "/home/stack/x/local/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 173, in get
    return self.request(url, 'GET', **kwargs)
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/client.py", line 94, in request
    raise exceptions.from_response(resp, body, url, method)
  File "/home/stack/x/local/lib/python2.7/site-packages/novaclient/exceptions.py", line 298, in from_response
    message = error.get('message')
AttributeError: 'unicode' object has no attribute 'get'
ERROR (AttributeError): 'unicode' object has no attribute 'get'