LocalResponse/node-sdk — pull request #7 by dirkbonhomme (2013-07-10 14:58:36+00:00)
Title: Prevent exception when trying to unsubscribe an unknown hash

Calling unsubscribe with an unknown hash causes an exception `TypeError: Cannot set property 'state' of undefined`

**Solution:**
When the hash is not present in `this.streams`, we reject the promise