title: eb deploy ERROR: TypeError - cannot concatenate 'str' and 'NoneType' objects
body: <p>Sorry I don't see this question anywhere. I've deployed an environment for my application "scones" on AWS. It's fairly simple Node.js express app. Honestly it's just to test the elastic beanstalk deployment. Anyhoo I'm using ebcli and I've already done an "eb create scones1" and it does create the environment and launches it. But when I make some changes (not committed to git) and type 'eb deploy' on the command line I receive <code>ERROR: TypeError - cannot concatenate 'str' and 'NoneType' objects</code> every time. Even if I enter the environment name. Doesn't matter. What is happening? None of the documentation seems to mention any error like this. Is there an issue with my Python version? I</p>