Fix undefined variable notice.

git-svn-id: https://plugins.svn.wordpress.org/debug-bar-slow-actions/trunk@937337 b8457f37-d9ea-0310-8a92-e5e31aec5664
Ship 0.8.3


git-svn-id: https://plugins.svn.wordpress.org/debug-bar-slow-actions/trunk@937342 b8457f37-d9ea-0310-8a92-e5e31aec5664