fix(autocomplete): store hasNotFoundTemplate in shared element

As before, the `hasNotFoundTemplate` Boolean was stored in the directive function so its used by all `autocomplete` directives, and that's wrong

Fixes angular#5865

src/components/autocomplete/js/autocompleteDirective.js

@@ -118,7 +118,6 @@ angular
  */
 
 function MdAutocomplete () {
- var hasNotFoundTemplate = false;
 
  return {
  controller: 'MdAutocompleteCtrl',
@@ -145,7 +144,8 @@ function MdAutocomplete () {
  inputId: '@?mdInputId'
  },
  link: function(scope, element, attrs, controller) {
- controller.hasNotFound = hasNotFoundTemplate;
+ controller.hasNotFound = element.hasNotFoundTemplate;
+ delete element.hasNotFoundTemplate;
  },
  template: function (element, attr) {
  var noItemsTemplate = getNoItemsTemplate(),
@@ -154,7 +154,7 @@ function MdAutocomplete () {
  tabindex = attr.tabindex;
 
  // Set our variable for the link function above which runs later
- hasNotFoundTemplate = noItemsTemplate ? true : false;
+ element.hasNotFoundTemplate = !!noItemsTemplate;
 
  if (attr.hasOwnProperty('tabindex')) {
  element.attr('tabindex', '-1');