fix import errors from qwen-image model

lightx2v/models/networks/qwen_image/model.py

@@ -2,7 +2,11 @@ import json
 import os
 
 import torch
-from diffusers.models.transformers.transformer_qwenimage import QwenImageTransformer2DModel
+
+try:
+    from diffusers.models.transformers.transformer_qwenimage import QwenImageTransformer2DModel
+except ImportError:
+    QwenImageTransformer2DModel = None
 
 from .infer.post_infer import QwenImagePostInfer
 from .infer.pre_infer import QwenImagePreInfer

lightx2v/models/video_encoders/hf/qwen_image/vae.py

 import json
 import os
 
-import torch  # type: ignore
-from diffusers import AutoencoderKLQwenImage
-from diffusers.image_processor import VaeImageProcessor
+import torch
+
+try:
+    from diffusers import AutoencoderKLQwenImage
+    from diffusers.image_processor import VaeImageProcessor
+except ImportError:
+    AutoencoderKLQwenImage = None
+    VaeImageProcessor = None
 
 
 class AutoencoderKLQwenImageVAE: