Mx.Effects.Effect - CaptureValues() Throws Null Ref Exception

Steps to reproduce:
1. Run the following app in debug.

Actual Results:
An null ref exception is thrown from the stack CaptureEndValues() --> CaptureValues, because the propertyChanges array is null and not checked.

Expected Results:
The captureValues() method should note the array is null and behave accordingly.

SAMPLE APP:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="Init()">

<mx:Script>
<![CDATA[
private function Init():void

]]
>
</mx:Script>

<mx:MaskEffect id="testEffect" />

</mx:Application>