Fixed import/export bug

git-svn-id: https://plugins.svn.wordpress.org/easy-digital-downloads-csv-manager/trunk@753812 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix merge issue

git-svn-id: https://plugins.svn.wordpress.org/easy-digital-downloads-csv-manager/trunk@753814 b8457f37-d9ea-0310-8a92-e5e31aec5664