Generator assumes non-null struct member IDisposables.

[plynkus]

Observed: NREs fired during disposal of valid WriteDescriptorSet instances (some members null).

Current generated Dispose() for WriteDescriptorSet:

		override public void Dispose (bool disposing)
		{
			base.Dispose (disposing);
			if (!disposing)
				return;
			refImageInfo.Dispose ();
			refImageInfo = null;
			refBufferInfo.Dispose ();
			refBufferInfo = null;
			refTexelBufferView.Dispose ();
			refTexelBufferView = null;
		}

...but per the spec, null is valid for each (ignored, depending on the rest of the configuration).

Suggested fix (not locally tested here but seems pretty obvious) is to change the generator's disposal emits to, e.g., refImageInfo?.Dispose ();.