Call updateSuggestions w/o query on input change (#66)

As long as `canShowSuggestions()` is still cool with it.

This removes the assumption that the implementor doesn't want to do something with the suggestions even when there's no query. They might want to show something like instructions or helper UI, or even some pre-generated default suggestions. This is now all possible.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ngc-omnibox",
-  "version": "0.4.3",
+  "version": "0.5.0",
   "description": "A modern, flexible, Angular 1.x autocomplete library with limited assumptions.",
   "main": "dist/ngc-omnibox.js",
   "scripts": {

spec/tests/angularComponent/ngcOmniboxControllerSpec.js

@@ -24,6 +24,8 @@ describe('ngcOmnibox.angularComponent.ngcOmniboxController', () => {
     omniboxController.isSelectable = () => {};
     omniboxController.onChosen = () => {};
     omniboxController.onUnchosen = () => {};
+    omniboxController.canShowSuggestions = () => {};
+    omniboxController.source = () => Promise.resolve([]);
   });
 
   it('should inject $document, $element, and $scope', () => {

src/angularComponent/ngcOmniboxController.js

@@ -521,7 +521,9 @@ export default class NgcOmniboxController {
     if (!this.query) {
       this.hideSuggestions = true;
       this.hint = null;
-    } else {
+    }
+
+    if (this.canShowSuggestions({query: this.query, omnibox: this}) !== false) {
       this.updateSuggestions();
     }
   }