Clean up admin bar node removal. Make it PHP4 safe and prevent display of...

Clean up admin bar node removal.  Make it PHP4 safe and prevent display of blank spots. Props sorich87, SergeyBiryukov. fixes #16005

git-svn-id: https://core.svn.wordpress.org/trunk@17184 1a063a9b-81f0-0310-95a4-ce76da25c4cd