fixed php warning in admin.

git-svn-id: https://plugins.svn.wordpress.org/wpf-woocommerce/trunk@952862 b8457f37-d9ea-0310-8a92-e5e31aec5664
version bump

git-svn-id: https://plugins.svn.wordpress.org/wpf-woocommerce/trunk@952864 b8457f37-d9ea-0310-8a92-e5e31aec5664