优化图片旋转的判断

util/image_util.py

@@ -111,7 +111,7 @@ def rotate(image, angle):
     :param angle: 逆时针旋转角度
     :return: 旋转后的图片NumPy数组
     """
-    if angle == 0:
+    if angle == 0 or image is None or image.size == 0:
         return image
     height, width = image.shape[:2]
     if angle == 180: