I added the `rocon_python_comms.find_topic` call some time ago. This raises the rocon_python_comms.NotFoundException, so if it gets past this, there will typically be master info.

I see now the subscriber proxy can return None if it times out. See [here](https://github.com/robotics-in-concert/rocon_tools/blob/indigo/rocon_python_comms/src/rocon_python_comms/subscriber_proxy.py#L49). That is what was happening to you before.

To be complete, you should check for that.