CC-4186: Playlist Builder -> Smart Playlist : The static Smart Playlist's length value will be empty if no file meet the criteria.

- fixed

airtime_mvc/application/models/Block.php

@@ -883,6 +883,7 @@ EOT;
     public function deleteAllFilesFromBlock()
     {
         CcBlockcontentsQuery::create()->findByDbBlockId($this->id)->delete();
+        $this->block->reload();
     }
     
     // smart block functions start