made search field optional

git-svn-id: https://plugins.svn.wordpress.org/salt-map/trunk@847870 b8457f37-d9ea-0310-8a92-e5e31aec5664
made search field optional

git-svn-id: https://plugins.svn.wordpress.org/salt-map/trunk@847872 b8457f37-d9ea-0310-8a92-e5e31aec5664