fixed small bug

git-svn-id: https://plugins.svn.wordpress.org/27coupons/trunk@746497 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated 2.1

git-svn-id: https://plugins.svn.wordpress.org/27coupons/trunk@746499 b8457f37-d9ea-0310-8a92-e5e31aec5664