[Dovecot] Default for non-present LDAP attributes?

[Edgar Fuß]

With 1.2, is there a syntax to, for LDAP lookups, use a given fixed replacement 
for a non-present LDAP attribute?
E.g. something that would extend
        user_attrs = mailFileServer=mail=maildir:/import/mail/%$/%d
to use maildir:/import/mail/foo/%d in case the mailFileServer attribute is not 
present?