Error with Django bundle's num-unit=0 option

I don't think bundle needs subordinate to have num-units=0 anymore.
Without it it deploy just fine but with it I got this error:

juju-deployer --config=django.yaml
2014-04-09 10:05:54 Using deployment single
2014-04-09 10:05:54 Starting deployment of single
2014-04-09 10:05:56 Deploying services...
2014-04-09 10:05:56 Deploying service gunicorn using cs:precise/gunicorn-9
2014-04-09 10:05:57 Error deploying service 'gunicorn'
2014-04-09 10:05:57 Command (juju deploy -e local --num-units 0 cs:precise/gunicorn-9 gunicorn) Output:

 error: --num-units must be a positive integer

2014-04-09 10:05:57 Deployment stopped. run time: 2.64

dpkg -l | grep juju
[...]
ii juju 1.18.0-0ubuntu12.04.1~juju1 next generation service orchestration system
ii juju-core 1.18.0-0ubuntu12.04.1~juju1 Juju is devops distilled - client
ii juju-deployer 0.3.4-0ubuntu1~precise1~ppa1 Deploy complex stacks of services using Juju
ii juju-local 1.18.0-0ubuntu12.04.1~juju1 dependency package for the Juju local provider
ii mongodb-clients 1:2.2.4-0ubuntu1~ubuntu12.04.1~juju1 object/document-oriented database (client apps)
ii mongodb-server 1:2.2.4-0ubuntu1~ubuntu12.04.1~juju1 object/document-oriented database (server package)
ii python-jujuclient 0.17.5-0ubuntu1~precise1~ppa1 Python API client for juju