* Fixed: Empty exports
* Changed: Better detection of empty exports
* Changed: Better detection of empty data types
* Added: Customer Filter to Export screen
* Added: Filter Customers by Order Status option 
* Added: Using is_wp_error() throughout CPT and Term requests

git-svn-id: https://plugins.svn.wordpress.org/woocommerce-exporter/trunk@919917 b8457f37-d9ea-0310-8a92-e5e31aec5664