menuconfig: avoid crashing when leaving menu not in parent#4

tejlmand merged 1 commit intozephyrproject-rtos:mainzephyrproject-rtos/Kconfiglib:mainfrom

leandrolanzieri:pr/menuconfig/fix_leaving_menuleandrolanzieri/zephyr_Kconfiglib:pr/menuconfig/fix_leaving_menuCopy head branch name to clipboard