Git Warning - remote HEAD refers to nonexistent ref, unable to checkout.

[majid4466]

I wanted to test heroku's websocket support and tried to follow the steps in this article:
https://devcenter.heroku.com/articles/node-websockets

However, when I tried the first command:
$ git clone https://github.com/heroku-examples/node-ws-test.git

instead of having a clone of this app, a warning was shown saying:
Cloning into node-ws-test...
warning: remote HEAD refers to nonexistent ref, unable to checkout.

Searching for the message, I found this SO Q&A:
http://stackoverflow.com/q/1961274/66580

But it appears only the owner of the repo could do what is suggested by the answer.