Show 0 tests when there are no tests at all

![http://f.cl.ly/items/3o1f3C0P2z1y163c103g/Screen%20Shot%202014-01-02%20at%206.47.12%20PM.png](http://f.cl.ly/items/3o1f3C0P2z1y163c103g/Screen%20Shot%202014-01-02%20at%206.47.12%20PM.png)

Fixes #1