Problem getting powerstrip container to run

[binocarlos]

My woefully bad (i.e. non-existent) knowledge of python is preventing me from working out why I can't get the powerstrip container to run.

I am building the container using this command from the master branch of powerstrip:

$ docker build -t clusterhq/powerstrip .

At first the error was saying that the yaml and treq packages could not be found so I added them to the Dockerfile as follows:

RUN         pip install service_identity pycrypto pyyaml treq && \

However - now I'm getting this error:

Unhandled Error
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 642, in run
    runApp(config)
  File "/usr/local/lib/python2.7/dist-packages/twisted/scripts/twistd.py", line 23, in runApp
    _SomeApplicationRunner(config).run()
  File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 376, in run
    self.application = self.createOrGetApplication()
  File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 441, in createOrGetApplication
    application = getApplication(self.config, passphrase)
--- <exception caught here> ---
  File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 452, in getApplication
    application = service.loadApplication(filename, style, passphrase)
  File "/usr/local/lib/python2.7/dist-packages/twisted/application/service.py", line 405, in loadApplication
    application = sob.loadValueFromFile(filename, 'application', passphrase)
  File "/usr/local/lib/python2.7/dist-packages/twisted/persisted/sob.py", line 210, in loadValueFromFile
    exec fileObj in d, d
  File "powerstrip.tac", line 11, in <module>
    if "://" not in DOCKER_HOST:
exceptions.TypeError: argument of type 'NoneType' is not iterable

Failed to load application: argument of type 'NoneType' is not iterable

I'm am most probably doing it wrong but am a bit stuck so was wandering if you could teach me to suck python eggs (to coin a phrase) and tell me what is going wrong here.

[binocarlos]

Docker file builds now!