refactor(iso): Inform user partition's missing (#3)

setup.sh

@@ -136,6 +136,22 @@ function select_part () {
         parts="$(get_parts "${part_type}")"
     fi
 
+    if [[ ! "${parts}" ]]; then
+        case "${part_type}" in
+            efi)
+                part_type_human_readable='EFI system partition (ESP) with partition type code EF00'
+                ;;
+            zfs)
+                part_type_human_readable='ZFS zpool partition with partition type code BF00'
+                ;;
+        esac
+        printf -- '%s\n' \
+            'It looks as if there is no '"${part_type_human_readable}" \
+            'on any of the disks. Did you correctly partition a disk before starting?' \
+            'Check https://quico.space/quico-os-setup/arch-zbm#prep. Exiting ...'
+        exit 77
+    fi
+
     if we_have_exactly_one_part "${part_type}" "${parts}"; then
         part="${parts}"
     else