Fix adding new groups from admin interface

Changelog

@@ -1,3 +1,5 @@
+2018-08-26 DariusIIi
+	* Fix: Fix adding new groups from admin interface
 2018-08-24 DariusIII
 	* Chg: Update spatie/laravel-permission to version 2.17.0
 	* Fix: Fix adding new roles

app/Http/Controllers/Admin/GroupController.php

@@ -106,7 +106,7 @@ class GroupController extends BasePageController
 
         switch ($action) {
             case 'submit':
-                if ($request->input('id') === '') {
+                if (empty($request->input('id'))) {
                     // Add a new group.
                     $request->merge(['name' => Group::isValidGroup($request->input('name'))]);
                     if ($request->input('name') !== false) {