fix bug (#346)

Co-authored-by: Yang Yong (雍洋) <yongyang1030@163.com>

lightx2v/models/runners/wan/wan_animate_runner.py

@@ -5,7 +5,14 @@ import cv2
 import numpy as np
 import torch
 import torch.nn.functional as F
-from decord import VideoReader
+from loguru import logger
+
+try:
+    from decord import VideoReader
+except ImportError:
+    VideoReader = None
+    logger.info("If you need run animate model, please install decord.")
+
 
 from lightx2v.models.input_encoders.hf.animate.face_encoder import FaceEncoder
 from lightx2v.models.input_encoders.hf.animate.motion_encoder import Generator