dxcam.release doesn't cleanup properly

[lovettchris]

If I call dxcam.release it releases the duplicator, but if I dxcam.create the same dx output it warns me that it is returning the existing instance from the DXFactory self._camera_instances[instance_key] and tries to use it but then the duplicator blows up trying to dereference a None object in self.duplicator.AcquireNextFrame.