title: How do I only show an element if nested ng-repeat is not empty?
body: <p>I have a List of lists, created with a nested ng-repeat. Each outer ng-repeat contains a div with the label of its inner list (eg: "Group A"). I'm now trying to create a way to avoid showing this label if the inner list is empty due to filtering(Applied by an input searchtext)</p>
  
  <p>Here is a plunker explaining my issue and my attempted solution : <a href="http://plnkr.co/edit/2rd8rNAUe05N6pFKwKTn?p=preview">Plnkr</a></p>
  
  <p>Having a 'heavy' function like isGroupEmpty seems extremely cumbersome - Is there any way to do this in a much simpler fashion? I was toying with the idea of moving the label inside the inner ng-repeat and having <code>ng-show="$first"</code> but it doesnt look great</p>