mod_advertise sends (null) X-Manager-Address by default

By default, httpd.conf contains no configuration directives for the advertise module, yet advertise is enabled by default (i.e. ServerAdvertise default is On). With no other configuration, JBoss's advertisement listener receives multicast messages with the header:

X-Manager-Address: (null):0

This is not very clean.
If the advertise module cannot determine an advertisement address/port, then no multicast message should be sent at all (i.e. as if ServerAdvertise was Off), rather than sending a message with an invalid address.
Since some kind of advertise directive is needed to indicate which address/port to use, why not default ServerAdvertise to Off?