GLUI: Fix null label icon (#17538)

intl/msg_hash_lbl.h

@@ -1550,6 +1550,10 @@ MSG_HASH(
    MENU_ENUM_LABEL_DISK_OPTIONS,
    "core_disk_options"
    )
+MSG_HASH(
+   MENU_ENUM_LABEL_DISK_INDEX,
+   "core_disk_index"
+   )
 MSG_HASH(
    MENU_ENUM_LABEL_DOWNLOADED_FILE_DETECT_CORE_LIST,
    "downloaded_file_detect_core_list"

menu/drivers/materialui.c

@@ -10692,6 +10692,8 @@ static void materialui_list_insert(void *userdata,
              * switch */
             break;
          default:
+            if (string_is_equal(label, "null"))
+               break;
 #ifdef HAVE_CHEEVOS
             if (type >= MENU_SETTINGS_CHEEVOS_START &&
                type < MENU_SETTINGS_NETPLAY_ROOMS_START)