How to change "++[files] returns noop " into "++[files] returns reject"

[thomas.dohl at 24-7-it-services.de]

Hi all,

in the section "authorize" I include the module "file".
(/etc/raddb/users)
At the moment I get an noop if a user is not found in the file.
How can I change it to return a reject, if a user is not found?

Now: 
++[files] returns noop
Destination:
++[files] returns reject


Thanks in advance,
Thomas