Sergey Biryukov b1847ef3e2 Menus: In wp_setup_nav_menu_item() and Walker_Nav_Menu_Edit::start_el(), check if the post or term associated with the menu item still exists to avoid a PHP notice.
If the associated post or term no longer exists, mark the menu item as invalid.

Props mehulkaklotar, kamrankhorsandi, cristiano.zanca, SergeyBiryukov.
Fixes #31703.
Built from https://develop.svn.wordpress.org/trunk@45891


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