fix ValueError exception when no disks are detected in the disk menu (#4598)

* Fix ValueError exception when no disks are detected in the disk menu

in lib/disk/disk_menu.py, the menu items are created using info from a list called "devices" (device_handler.devices). when no block devices are detected, the list is empty, creating zero MenuItems, and causing the following ValueError:

ValueError: Menu must have at least one item

this change checks if the length of the list is shorter than 1  (empty list) before constructing the menu. if the list is empty, the user will be notified that no disks were detected. otherwise, the menu is created and behaves as normal

* Fixed ruff formatting issue

* Fixed ruff formatting issue

---------

Co-authored-by: Anton Hvornum <torxed@archlinux.org>

archinstall/lib/disk/disk_menu.py

@@ -311,6 +311,10 @@ async def select_devices(preset: list[BDevice] | None = []) -> list[BDevice] | N
 
 	devices = device_handler.devices
 
+	if len(devices) < 1:
+		await Notify(tr('No disks were detected. A disk is required to be able to install Arch Linux')).show()
+		return None
+
 	items = [
 		MenuItem(
 			str(d.device_info.path),