Added an alert when pages have no fields to import

git-svn-id: https://plugins.svn.wordpress.org/gathercontent-import/trunk@784944 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changed version number

git-svn-id: https://plugins.svn.wordpress.org/gathercontent-import/trunk@784946 b8457f37-d9ea-0310-8a92-e5e31aec5664