Peter Wilson 6de7c69c0d Menus: Prevent notice thrown in class-walker-page.php.
Calling `Walker_Page::walk()` directly was causing an `Undefined index: item_spacing` notice to be thrown, this adds an `isset()` check to prevent it.

Props bhargavbhandari90.
Fixes #39564.


git-svn-id: https://develop.svn.wordpress.org/trunk@39949 602fd350-edb4-49c9-b593-d223f7449a82
2017-01-24 23:28:13 +00:00
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