Puppet users - Jul 2012 - empty() function in stdlib not functional?

I''m using the empty function to test whether an array passed to my
defined type is empty (it''s a function to set up network interfaces
and their routes if passed an array of routes). Unfortunately, I get
this error when trying to use the empty() function:


err: Could not retrieve catalog from remote server: Error 400 on
SERVER: Function ''empty'' does not return a value at
/etc/puppet/
modules/netif/manifests/init.pp:78 on node [REDACTED]t
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run

Relevant code snippet is here:


define netif::interface ( $ifaddr = "", $slaves = [] , $onboot
"yes", $onparent = "yes" , $mtu = "" , $routes =
undef)
{

    # switch on interface name
    case $name {
        # catch alias first since it might match other stuff
        /^.*:.*$/ : {
            netif::alias { $name :
                ifaddr => $ifaddr ,
            }
        }
        # regular ethernet interface.
        /^eth\d+$/ : {
            netif::eth { $name :
                ifaddr => $ifaddr ,
            }
        }
        # vlan ethernet interface.
        /^eth\d+\.\d+$/ : {
            netif::eth_vlan { $name :
                ifaddr => $ifaddr ,
            }
        }
        # regular ib interface.
        /^ib\d+$/ : {
            netif::ib { $name :
                ifaddr => $ifaddr ,
            }
        }
        # partitioned ib interface.
        /^ib\d+\.\d+$/ : {
            netif::ib_pkey { $name :
                ifaddr => $ifaddr ,
            }
        }
        # bridge interface
        /^br\d+$/ : {
            netif::br { $name :
                ifaddr => $ifaddr ,
                slaves => $slaves ,
            }
        }
        # tap interface
        /^tap\d+$/ : {
            netif::tap { $name :
                ifaddr => $ifaddr ,
            }
        }

        # default case do nothing
        default : { notify {"netif: interface type ${name} not
found.":} }
    }

    # make route file
    if !empty($routes) {
        netif::route { $name :
            routes => $routes
        }
}

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