Undefined property: tabs in ObjectView.php on line 82

I've just upgraded to the latest HEAD release and am getting the 
following error when I view or edit an entry in either the shared or 
personal address book (both held in LDAP)

Undefined property: tabs in /var/www/horde/turba/lib/ObjectView.php on 
line 82

Looking in sources.php.dist I see 'tabs' is a new entry, although listed 
as optional. If I define some tabs the error goes away, but at the 
moment I dont want to define any :)

Although listed as optional, is there anything I need to do to stop 
turba trying to use tabs?

Andy.
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