- Avoid throwing a fatal error if for some reason the global $WP_Statistics variable has been destroyed during a page load.

git-svn-id: https://plugins.svn.wordpress.org/wp-statistics/trunk@1037136 b8457f37-d9ea-0310-8a92-e5e31aec5664
- Various security fixes, thanks Ryan.

git-svn-id: https://plugins.svn.wordpress.org/wp-statistics/trunk@1037137 b8457f37-d9ea-0310-8a92-e5e31aec5664