Avoid npe because of deleted spinner

src/prefs.js

@@ -141,7 +141,6 @@ const WeatherPrefsWidget = new GObject.Class({
         this.searchMenu = this.Window.get_object("search-menu");
         this.searchName = this.Window.get_object("search-name");
         this.searchCombo = this.Window.get_object("search-combo");
-        this.spinner = this.Window.get_object("spinner");
 
         this.searchName.connect("icon-release", Lang.bind(this, this.clearEntry));
         this.editName.connect("icon-release", Lang.bind(this, this.clearEntry));
@@ -176,13 +175,10 @@ const WeatherPrefsWidget = new GObject.Class({
             if (location === "")
                 return 0;
 
-            let item;
-            if (this.spinner.get_parent()) {
-                item = this.spinner.get_parent();
-            }else {
-                item = new Gtk.MenuItem()
-                item.add(this.spinner);
-            }
+            let item = new Gtk.MenuItem();
+            let spinner = new Gtk.Spinner();
+            spinner.start();
+            item.add(spinner);
 
             this.searchMenu.append(item);
             this.showSearchMenu();