Fixed more undefined indexes.

git-svn-id: https://plugins.svn.wordpress.org/ads-by-datafeedrcom/trunk@858020 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated author name in readme.

git-svn-id: https://plugins.svn.wordpress.org/ads-by-datafeedrcom/trunk@858022 b8457f37-d9ea-0310-8a92-e5e31aec5664