I received the following response from Cisco TAC...
The default behavior for MPE
when the location field is left blank is to populate the location field with
the MPE Server URL and the meeting id in parenthesis. If you do not want this
to appear, you must enter location information or something in the location
field. There is no template or code that you can modify to change this. If
this continues to be a concern, you can contact your Cisco Account Team and
have them open a formal enhancement request for the MPE application.