Update src/diffusers/models/transformers/transformer_sd3.py

Co-authored-by: YiYi Xu <[email protected]>

Author: hlky

src/diffusers/models/transformers/transformer_sd3.py

@@ -369,7 +369,6 @@ def forward(
             If `return_dict` is True, an [`~models.transformer_2d.Transformer2DModelOutput`] is returned, otherwise a
             `tuple` where the first element is the sample tensor.
         """
-        joint_attention_kwargs = joint_attention_kwargs or {}
         if joint_attention_kwargs is not None:
             joint_attention_kwargs = joint_attention_kwargs.copy()
             lora_scale = joint_attention_kwargs.pop("scale", 1.0)