fix(filemanager): 从未设置过目录同步的首次设置，报None Type no restrip

web/main.py

@@ -1097,7 +1097,20 @@ def get_hardlink_info(folder):
                 result, sync_class, link_path, link_direction = match_sync_dir(folder, dir[1], dir[0], dir[2], '←')
                 if result: break
         return sync_class, link_path, link_direction
-
+
+    def add_paths_to_media_dirs(paths, media_dirs):
+        """
+        添加路径到媒体目录列表。
+
+        :param paths: 待添加的路径列表
+        :param media_dirs: 媒体目录列表
+        """
+        if not paths:
+            return
+
+        valid_paths = [pathElement.rstrip('/') for pathElement in paths if StringUtils.is_string_and_not_empty(pathElement)]
+        media_dirs.extend(valid_paths)
+
     def get_media_dirs():
         """
         获取媒体库目录
@@ -1107,10 +1120,10 @@ def get_media_dirs():
         tv_path = Config().get_config('media').get('tv_path')
         anime_path = Config().get_config('media').get('anime_path')
         unknown_path = Config().get_config('media').get('unknown_path')
-        if movie_path is not None: media_dirs.extend([path.rstrip('/') for path in movie_path])
-        if tv_path is not None: media_dirs.extend([path.rstrip('/') for path in tv_path])
-        if anime_path is not None: media_dirs.extend([path.rstrip('/') for path in anime_path])
-        if unknown_path is not None: media_dirs.extend([path.rstrip('/') for path in unknown_path])   
+        add_paths_to_media_dirs(movie_path, media_dirs)
+        add_paths_to_media_dirs(tv_path, media_dirs)
+        add_paths_to_media_dirs(anime_path, media_dirs)
+        add_paths_to_media_dirs(unknown_path, media_dirs)  
         return list(set(media_dirs))
 
     def get_download_dirs():