Fix exception. Although it will be auto-instantiated it's better to explicitily use the exception instance

volatility3/framework/interfaces/objects.py

@@ -133,7 +133,7 @@ class ObjectInterface(metaclass=abc.ABCMeta):
 
     def __getattr__(self, attr: str) -> Any:
         """Method for ensuring volatility members can be returned."""
-        raise AttributeError
+        raise AttributeError()
 
     @property
     def vol(self) -> ReadOnlyMapping: