How to check if HTML5 FileSystemDirectoryHandle points to an existing directory

Lets say I have a refetence to a FileSystemDirectoryHandle, obtained by showDirectoryPicker(), which might have been deleted (at some point in time after referencing). What is the proper API to check if it points to an existing directory?

I can try-catch for await (const entry of directory.values()) but I wonder if there is something more appropriate.

I was thinking of using getDirectoryHandle but I do not have parent reference, nor does it accept empty name argument.