- instantiate assetManager when deserializing FilterPostProcessor

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7710 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/post/FilterPostProcessor.java

@@ -481,6 +481,7 @@ public class FilterPostProcessor implements SceneProcessor, Savable {
         InputCapsule ic = im.getCapsule(this);
         numSamples = ic.readInt("numSamples", 0);
         filters = ic.readSavableArrayList("filters", null);
+        assetManager = im.getAssetManager();
     }
 
     /**