Do not show empty load/save dropdowns

This doesn't make any sense.

![load](http://cl.ly/image/0p1h1s1H233J/Screen%20Shot%202013-10-29%20at%2012.41.44.png)
![save](http://cl.ly/image/003U3j2I3x1F/Screen%20Shot%202013-10-29%20at%2012.42.47.png)

I also removed `$scope.advancedLoad` and  `$scope.advancedSave` because I didn't find any usages.