Activity summary issue

The push notification created by changing the visibility of 2 content items doesn't have a description. When refreshing the page, this is not an issue, as the activities are not aggregated.

![screen shot 2014-01-29 at 19 27 42](https://f.cloud.github.com/assets/109850/2033364/c6ac0d32-891b-11e3-93bc-b0c71479e62e.png)