Fix Noise_EmptyNoise when using nested latents

[kijai]

Fixes the following issue when doing split sampling with SamplerCustom and LTX2.

 File "N:\AI\ComfyUI\comfy\samplers.py", line 745, in sample
    noise = model_wrap.inner_model.model_sampling.noise_scaling(sigmas[0], noise, latent_image, self.max_denoise(model_wrap, sigmas))
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "N:\AI\ComfyUI\comfy\model_sampling.py", line 72, in noise_scaling
    return sigma * noise + (1.0 - sigma) * latent_image
           ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RuntimeError: The size of tensor a (1024) must match the size of tensor b (131200) at non-singleton dimension 2