Pascal Birchler 6bf5465f67 Menus: Fix _wp_expand_nav_menu_post_data() for PHP 5.2.
[37748] introduced `_wp_expand_nav_menu_post_data()` together with an `array_replace_recursive()` compatibility function for PHP 5.2.
Even though that compat function is tried and tested in other projects like BuddyPress, we need to add additional `isset()` checks in order to avoid 'Undefined index' notices in our case.

See #36590.

git-svn-id: https://develop.svn.wordpress.org/trunk@37750 602fd350-edb4-49c9-b593-d223f7449a82
2016-06-19 12:50:15 +00:00
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