little style changes

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@993918 b8457f37-d9ea-0310-8a92-e5e31aec5664
to fix php warning which is Invalid argument supplied for foreach() 

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@993919 b8457f37-d9ea-0310-8a92-e5e31aec5664