Exception when building non-configured bundle

[sebdah]

When trying to build a bundle that does not have any config the following exception appear:

2013-09-24 12:09:19,688 - cumulus - lib.bundler - INFO - Building bundle database
Traceback (most recent call last):
  File "../cumulus/cumulus/cumulus", line 11, in <module>
    lib.main()
  File "/Users/sebastian/git/skymill/cumulus/cumulus/lib/__init__.py", line 59, in main
    bundler.build_bundles()
  File "/Users/sebastian/git/skymill/cumulus/cumulus/lib/bundler.py", line 18, in build_bundles
    config_handler.get_bundle_paths(bundle))))
TypeError

My config at the time:

[environment: stage]
access-key-id: SECRET
secret-access-key: SECRET
bucket: se.skymill.bundles
region: eu-west-1
stacks: stage
bundles: webserver, database
version: 0.5.0-SNAPSHOT

[environment: production]
access-key-id: SECRET
secret-access-key: SECRET
bucket: se.skymill.bundles
region: eu-west-1
stacks: production
bundles: webserver, database
version: 0.4.0

[stack: stage]
template: /Users/sebastian/git/skymill/web/cf-templates/webserver.json
disable-rollback: true

[stack: production]
template: /Users/sebastian/git/skymill/web/cf-templates/webserver.json
disable-rollback: false

[bundle: webserver]
paths: /Users/sebastian/git/skymill/web/hosts/webserver