- Deletes post notification history record when no posts are found and

when sending queue record is deleted
- Reverts back changes to the model's delete() method
- Updates unit tests

lib/Models/SendingQueue.php

@@ -52,13 +52,6 @@ class SendingQueue extends Model {
     return $this;
   }
 
-  function delete() {
-    if($parent_newsletter = $this->newsletter()->findOne()) {
-      $parent_newsletter->delete();
-    };
-    return parent::delete();
-  }
-
   function getSubscribers() {
     if(!is_serialized($this->subscribers)) {
       return $this->subscribers;