[exim] smarhost + empty file

Hi Guys,

I wanted to use a smarthost server in a seperate file for exim, Found
this info in the docs, which works perfect, only little problem I have
is, when my /etc/smarthost file is empty, exim is not sending the mail
from himself, but gives a error in the log:
error in smarthost router: no host(s) specified for domain *

my lines in exim.conf
smarthost:
     driver = manualroute
     transport = remote_smtp
     route_list = * ${readfile{/etc/smarthost}{}}

I presume I have to use some condition statement, but not sure how to do
this?

Any guidance would be appreciated

Thanks
J

-- 
/*---------------------------------------------------------------------*/
                        __   _                
            ---------- / /  (_)__  __ ____  __  ---------  
              ------- / /__/ / _ \/ // /\ \/ / -------- 
                ---- /____/_/_//_/\_,_/ /_/\_\ ------ 
                   localhost@???