remove check

model.py

@@ -90,8 +90,6 @@ class Model:
         seg_map = np.full(mask.shape[:-1], -1)
         for index, color in enumerate(COLOR_LIST):
             seg_map[np.sum(mask == color, axis=2) == 3] = index
-        if not (seg_map != -1).all():
-            return None
         return seg_map
 
     @staticmethod