Custom menus not showing

it turns out that after copying some code from another post (http://stackoverflow.com/questions/9439877/adding-menu-items-in-wordpress) for a filter in functions.php to add the search bar in the nav menu, when it wasn’t matching the menu, it was returning nothing (i.e erasing the $items)
I stupidly copied this code in without testing… and it was the problem all along!

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