Add missing Optional on a few nullable fields.

invokeai/backend/install/model_install_backend.py

@@ -7,7 +7,7 @@ import warnings
 from dataclasses import dataclass, field
 from pathlib import Path
 from tempfile import TemporaryDirectory
-from typing import List, Dict, Callable, Union, Set
+from typing import Optional, List, Dict, Callable, Union, Set
 
 import requests
 from diffusers import DiffusionPipeline
@@ -86,8 +86,8 @@ class ModelLoadInfo:
     name: str
     model_type: ModelType
     base_type: BaseModelType
-    path: Path = None
-    repo_id: str = None
+    path: Optional[Path] = None
+    repo_id: Optional[str] = None
     description: str = ""
     installed: bool = False
     recommended: bool = False

invokeai/backend/model_management/model_manager.py

@@ -276,7 +276,7 @@ class ModelInfo:
     hash: str
     location: Union[Path, str]
     precision: torch.dtype
-    _cache: ModelCache = None
+    _cache: Optional[ModelCache] = None
 
     def __enter__(self):
         return self.context.__enter__()