You need to update rosdistro to at least version 0.2.12. There was a critical bug fix which got released in that version of rosdistro, without which any new automated bloom pull requests will be incorrect.

You can update rosdistro like this on ubuntu:

$ sudo apt-get update

$ sudo apt-get install python-rosdistro

On other platforms:

$ sudo pip install -U rosdistro  # Only use this on non-ubuntu machines

I will release a new version of bloom in the near future which has a versioned dependency on rosdistro, and will prevent this problem from occurring in the future.

Sorry for the disruption.
--
William Woodall