src/vs/platform/userDataProfile/node/userDataProfile.ts/UserDataProfilesService/getWorkspace
class UserDataProfilesService:	protected getWorkspace(workspaceIdentifier: WorkspaceIdentifier): URI | EmptyWindowWorkspaceIdentifier {
		if (isSingleFolderWorkspaceIdentifier(workspaceIdentifier)) {
			return workspaceIdentifier.uri;
		}
		if (isWorkspaceIdentifier(workspaceIdentifier)) {
			return workspaceIdentifier.configPath;
		}
		return 'empty-window';
	}