Show pytorch adapter even if torch in not impoted.

Just realized that it is useful to show that the pytorch adapter is available even if torch is not imported. We will display 'torch not installed' error message when user actually uses the adapter.

src/server/package/src/model_explorer/extension_manager.py

@@ -19,11 +19,6 @@
 from importlib import import_module
 from typing import Any, Dict, Union
 
-try:
-  import torch
-except ImportError:
-  torch = None
-
 from .adapter_runner import AdapterRunner
 from .consts import MODULE_NAME
 from .extension_class_processor import ExtensionClassProcessor
@@ -41,9 +36,7 @@ class ExtensionManager(object, metaclass=Singleton):
           '.builtin_tf_mlir_adapter',
           '.builtin_tf_direct_adapter',
           '.builtin_graphdef_adapter',
-      ]
-      + (['.builtin_pytorch_exportedprogram_adapter'] if torch else [])
-      + [
+          '.builtin_pytorch_exportedprogram_adapter',
           '.builtin_mlir_adapter',
       ]
   )