Also fix issue with initial visibility of notice when there are no menus. Amends [41823]. Props bpayton, melchoyce, westonruter. See #42116. Fixes #42113. Built from https://develop.svn.wordpress.org/trunk@41832 git-svn-id: http://core.svn.wordpress.org/trunk@41666 1a063a9b-81f0-0310-95a4-ce76da25c4cd