Fix navigation bottom row size when there is no current site/beta switch


### Before

![screen shot 2014-07-28 at 11 25 44](https://cloud.githubusercontent.com/assets/85783/3719336/e3bf2798-1641-11e4-94bd-502cf9e0a944.PNG)

![screen shot 2014-07-28 at 11 29 25](https://cloud.githubusercontent.com/assets/85783/3719349/0e65a2e2-1642-11e4-9f4f-a4fb6657d726.PNG)



### After

![screen shot 2014-07-28 at 11 25 30](https://cloud.githubusercontent.com/assets/85783/3719338/e6911486-1641-11e4-96ab-ba325a0733c9.PNG)

![screen shot 2014-07-28 at 11 29 20](https://cloud.githubusercontent.com/assets/85783/3719351/1164748c-1642-11e4-864c-cdca078628d1.PNG)


![ ](http://gifs.joelglovier.com/ohhh/ohhh-minion.gif)