Don't try to minify js/libs folder if it doesn't exist
Don't try to minify js/libs folder if it doesn't exist

Signed-off-by: David Laing <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@davidlaing.com>

cityindex-attic/CIAPI.Js,cityindex-attic/CIAPI.Js