Fix `WP_DEBUG` complaints

git-svn-id: https://plugins.svn.wordpress.org/dirtysuds-postlist/trunk@1005835 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version 1.03

git-svn-id: https://plugins.svn.wordpress.org/dirtysuds-postlist/trunk@1005836 b8457f37-d9ea-0310-8a92-e5e31aec5664
Oops

git-svn-id: https://plugins.svn.wordpress.org/dirtysuds-postlist/trunk@1005839 b8457f37-d9ea-0310-8a92-e5e31aec5664