lookup_url_to_addresses: make sure we don't try to canonify something that is not a string
lookup_url_to_addresses: make sure we don't try to canonify something that is not a string

git-svn-id: 3f662d0c7823f96a484d6a9a7c90f2d7866b6747@1281 e454d3dc-12ff-0310-9b8b-94264392205f

bernardd/yxa,bernardd/yxa,bernardd/yxa,bernardd/yxa