fix(1.x/aDirective): handle anchor elts with no href

Closes #206

Author: btford

src/grammar.ats

@@ -21,6 +21,9 @@ export class Grammar {
   }
 
   recognize(url:string, componentName = '/') {
+    if (typeof url === 'undefined') {
+      return;
+    }
 
     var componentRecognizer = this.rules[componentName];
     if (!componentRecognizer) {

test/router-viewport.es5.spec.js

@@ -543,6 +543,21 @@ describe('ngViewport', function () {
     expect(elt.text()).toBe('link | two');
   });
 
+  // See https://github.com/angular/router/issues/206
+  it('should not navigate a link without an href', function () {
+    $router.config([
+      { path: '/', component: 'one' },
+      { path: '/two', component: 'two' },
+    ]);
+    expect(function() {
+      compile('<a>link</a>');
+      $rootScope.$digest();
+      expect(elt.text()).toBe('link');
+      elt.find('a')[0].click();
+      $rootScope.$digest();
+    }).not.toThrow();
+  });
+
 
   it('should change location to the canonical route', inject(function ($location) {
     compile('<div ng-viewport></div>');