prevent double header/footer appearance in event lists

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@839801 b8457f37-d9ea-0310-8a92-e5e31aec5664
release 1.2.4

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@839802 b8457f37-d9ea-0310-8a92-e5e31aec5664