nin run crashes in new projects

[stianjensen]

If you have just created a new project using nin new, and made an initial commit, nin run will fail with the following error:

$ nin run
Found nin.json in project root (/Users/stiaje/Projects/test-nin)
SockJS v0.3.16 bound to "/socket"
child_process.js:524
    throw err;
    ^

Error: Command failed: git config --get remote.origin.url

    at checkExecSyncError (child_process.js:481:13)
    at execSync (child_process.js:521:13)
    at Object.getProjectMetadata (/Users/stiaje/Projects/nin/nin/backend/utils.js:12:20)
    at /Users/stiaje/Projects/nin/nin/backend/serve.js:145:22
    at /Users/stiaje/Projects/nin/nin/node_modules/graceful-fs/graceful-fs.js:43:10
    at /Users/stiaje/Projects/nin/node_modules/graceful-fs/graceful-fs.js:43:10
    at FSReqWrap.oncomplete (fs.js:114:15)

The work-around for this error is setting a remote for your local git repo, but this should not be a requirement.