Default workspace config error

[abovedave]

If starting the app with a very minimal config file with paths not defined:

{
  "server": {
    "host": "127.0.0.1",
    "port": 3001
  },
  "cluster": false
}

The following error is thrown:

> node ./start.js

path.js:7
    throw new TypeError('Path must be a string. Received ' + inspect(path));
    ^

TypeError: Path must be a string. Received undefined
    at assertPath (path.js:7:11)
    at Object.resolve (path.js:1146:7)
    at Server.loadPaths (/web/dadi/lib/index.js:376:28)```