Create new django project
Publish project, import web site profile
(note that I didn't create a virtual env)
You'll get the error:
C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v11.0\Python Tools\Microsoft.PythonTools.Django.targets(394,7): Error MSB4184: The expression "[System.IO.Path]::GetDirectoryName('')" cannot be evaluated. The path is not of a legal form.
If this is because virtual env is required, we'll need to have a better error message.