[#7732] (unrelated) prevent empty LDAP login from proceeding
[#7732] (unrelated) prevent empty LDAP login from proceeding

heiths/allura,heiths/allura,apache/allura,lym/allura-git,heiths/allura,apache/allura,lym/allura-git,lym/allura-git,lym/allura-git,apache/allura,lym/allura-git,heiths/allura,apache/allura,heiths/allura,apache/allura