make residual optional.

finetrainers/conditioning/LTXVideoConditionedTransformer3DModel.py

@@ -93,7 +93,8 @@ class LTXVideoConditionedTransformer3DModel(LTXVideoTransformer3DModel):
             attention_kwargs: Optional[Dict[str, Any]] = None,
             return_dict: bool = True
         ) -> torch.Tensor:
-
+            if residual_x == None:
+                print("Residual Not included in the calculation.")
             image_rotary_emb = self.rope(hidden_states, num_frames, height, width, rope_interpolation_scale)
 
             # convert encoder_attention_mask to a bias the same way we do for attention_mask