fix(ng-repeat): should correctly handle detached state

lib/directive/ng_repeat.dart

@@ -185,6 +185,7 @@ class NgRepeatDirective {
   }
 
   _onCollectionChange(Iterable collection) {
+    if (!_scope.isAttached) return;
     dom.Node previousNode = _blockHole.placeholder; // current position of the
     // node
     dom.Node nextNode;

test/directive/ng_repeat_spec.dart

@@ -9,10 +9,15 @@ main() {
     beforeEach(inject((Injector injector, Scope $rootScope, Compiler compiler, DirectiveMap _directives) {
       $exceptionHandler = injector.get(ExceptionHandler);
       scope = $rootScope;
-      $compile = (html) {
+      $compile = (html, [blockScope]) {
         element = $(html);
         var blockFactory = compiler(element, _directives);
-        var block = blockFactory(injector, element);
+        var blockInjector = injector;
+        if (blockScope != null) {
+          blockFactory.bind(injector)(blockScope);
+        } else {
+          blockFactory(blockInjector, element);
+        }
         return element;
       };
       directives = _directives;
@@ -404,5 +409,19 @@ main() {
       });
     });
 
+
+    it('should correctly handle detached state', () {
+      scope.context['items'] = [1];
+
+      var parentScope = scope.createChild(new PrototypeMap(scope.context));
+      element = $compile(
+        '<ul>' +
+          '<li ng-repeat="item in items">{{item}}</li>' +
+        '</ul>', parentScope);
+
+      parentScope.destroy();
+      expect(scope.apply).not.toThrow();
+    });
+
   });
 }