fix reloading of Oraganizations bug(on News tab)

When A user is not part of any organization, `self.segmentedControl.userInteractionEnabled` is `NO` forever.

![skitched-20130101-182456](https://f.cloud.github.com/assets/19714/37177/1d1f18e2-53f5-11e2-9b52-f42187a4f223.png)