Bug fix: data with blank column name was causing query to fail and data not to be displayed

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-to-database-extension/trunk@948276 b8457f37-d9ea-0310-8a92-e5e31aec5664
Version: 2.8.2RC1

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-to-database-extension/trunk@948277 b8457f37-d9ea-0310-8a92-e5e31aec5664