Is there a way to make ng-show work for 0 length strings ''?
You can do something like this:
ng-show="zero.length >= 0"
If you want it only for zero length strings you can change it to:
ng-show="zero.length === 0"
Here's a plunkr: http://plnkr.co/K7DyPukQHcDyLAUw4Dua