Removes the 'extensions' directory from pyrightconfig.json and fixes … (#26512)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

api/extensions/storage/aliyun_oss_storage.py

@@ -33,7 +33,9 @@ class AliyunOssStorage(BaseStorage):
 
     def load_once(self, filename: str) -> bytes:
         obj = self.client.get_object(self.__wrapper_folder_filename(filename))
-        data: bytes = obj.read()
+        data = obj.read()
+        if not isinstance(data, bytes):
+            return b""
         return data
 
     def load_stream(self, filename: str) -> Generator: