Warning message fixes

git-svn-id: https://plugins.svn.wordpress.org/lightweight-social-sharing-buttons/trunk@1047122 b8457f37-d9ea-0310-8a92-e5e31aec5664
Committing 0.4

git-svn-id: https://plugins.svn.wordpress.org/lightweight-social-sharing-buttons/trunk@1047124 b8457f37-d9ea-0310-8a92-e5e31aec5664