Listing method update for Newsletters/Forms/Segments/Subscribers

- updated unit tests

lib/Listing/Handler.php

@@ -106,6 +106,7 @@ class Handler {
       );
     }
 
+    // get items and total count
     if(method_exists($this->model_class, 'listingQuery')) {
       $custom_query = call_user_func_array(
         array($this->model_class, 'listingQuery'),
@@ -135,7 +136,6 @@ class Handler {
         ->findMany();
     }
 
-
     return array(
       'count' => $count,
       'filters' => $filters,