removed display error

git-svn-id: https://plugins.svn.wordpress.org/sisow-for-woocommerce/trunk@838982 b8457f37-d9ea-0310-8a92-e5e31aec5664
3.3.13

git-svn-id: https://plugins.svn.wordpress.org/sisow-for-woocommerce/trunk@838983 b8457f37-d9ea-0310-8a92-e5e31aec5664