Fix for notifications showing repeatedly in admin web interface

When a question is submitted by a contestant, the notification in admin web interface is showing more than once (see the screenshot).

![533404c438d38774e413c0b2](https://cloud.githubusercontent.com/assets/338159/2536409/8272862c-b59f-11e3-8206-685efd0af7be.png)

This is a fix for it.