Ansible deployment failing on juju 1.20

[Max Brustkern]

I am trying to deploy a project on juju 1.20. I see this in the log:
unit-qlbr-0: 2014-08-29 19:54:07 INFO install Processing triggers for python-support ...
unit-qlbr-0: 2014-08-29 19:54:08 INFO install ERROR: /etc/ansible/host_vars/localhost: Expecting property name: line 1 column 1 (char 1)
unit-qlbr-0: 2014-08-29 19:54:08 INFO install Traceback (most recent call last):
unit-qlbr-0: 2014-08-29 19:54:08 INFO install File "/var/lib/juju/agents/unit-qlbr-0/charm/hooks/install", line 745, in <module>
unit-qlbr-0: 2014-08-29 19:54:08 INFO install hooks.execute(sys.argv)
unit-qlbr-0: 2014-08-29 19:54:08 INFO install File "/var/lib/juju/agents/unit-qlbr-0/charm/hooks/charmhelpers/core/hookenv.py", line 375, in execute
unit-qlbr-0: 2014-08-29 19:54:08 INFO install self._hooks[hook_name]()
unit-qlbr-0: 2014-08-29 19:54:08 INFO install File "/var/lib/juju/agents/unit-qlbr-0/charm/hooks/install", line 272, in install
unit-qlbr-0: 2014-08-29 19:54:08 INFO install charmhelpers.contrib.ansible.apply_playbook('playbooks/install.yaml')
unit-qlbr-0: 2014-08-29 19:54:08 INFO install File "/var/lib/juju/agents/unit-qlbr-0/charm/hooks/charmhelpers/contrib/ansible/__init__.py", line 112, in apply_playbook
unit-qlbr-0: 2014-08-29 19:54:08 INFO install subprocess.check_call(call)
unit-qlbr-0: 2014-08-29 19:54:08 INFO install File "/usr/lib/python2.7/subprocess.py", line 511, in check_call
unit-qlbr-0: 2014-08-29 19:54:08 INFO install raise CalledProcessError(retcode, cmd)
unit-qlbr-0: 2014-08-29 19:54:08 INFO install subprocess.CalledProcessError: Command '['ansible-playbook', '-c', 'local', 'playbooks/install.yaml']' returned non-zero exit status 1
unit-qlbr-0: 2014-08-29 19:54:08 ERROR juju.worker.uniter uniter.go:486 hook failed: exit status 1

If I try to run the ansible-playbook command myself on my deployment machine, I get:
ERROR: provided hosts list is empty
If I run it on the instance with the django charm, I get:
ERROR: /etc/ansible/host_vars/localhost: Expecting property name: line 1 column 1 (char 1)

My configuration file contains:
qlbr:
    vcs: bzr
    repos_url: lp:~canonical-platform-qa/qlbr/rtm-reports
    additional_distro_packages: "python-django,python-django-nose,python-memcache,memcached"

[Max Brustkern (nuclearbob)]

This seems to fail with a more minimal config as well:
dtest:
    vcs: bzr
    repos_url: lp:~nuclearbob/+junk/d_test