No such file or directory: 'env/webapp/content'

Title shortened for brevity's sake. The gist is that Calamari (at least in devmode) seems to complain if you haven't created a directory for the webapp. It is specified as a required step in the instructions (see: http://ceph.com/calamari/docs/development/dev_env.html) for setting up a dev environment, but...should that be a requirement for getting Calamari up and running? Also, I created the directory and the issue went away (without populating the directory with anything). If there's a reason why we need the GUI code for now, feel free to close the issue and let me know.

Read the development environment instructions at calamari/docs/development/dev_env.html and reproduce devmode startup without creating env/webapp/content. Trace where that directory is accessed, then determine whether startup should create or avoid requiring the empty directory; done means the documented setup and the reported startup behavior agree.

Written by the indexing model from the issue text.