Update AssetFilterManager.php
Update AssetFilterManager.php

Added the ability to set a service as NULL in extending modules so that the filter can be skipped.

chaos0815/AssetManager,chaos0815/AssetManager,wshafer/AssetManager,wshafer/AssetManager,pensiero/AssetManager,RWOverdijk/AssetManager,pensiero/AssetManager,RWOverdijk/AssetManager,hummer2k/AssetManager,hummer2k/AssetManager