[exim] Missing File creates error

ok - how do I get around this. Trying to create personal blackhole lists
- but - if the file doesn't exist - I want to bypass the router. Right
now it complains that the file is missing. I want a missing file to be a
no match.

personal_blackhole:
driver = redirect
data = :blackhole:
local_part_suffix=-*
local_part_suffix_optional
require_files = /etc/squirrelmail/prefs/$local_part@$domain.block
senders = /etc/squirrelmail/prefs/$local_part@$domain.block
domains = +virtual_local_domains
no_verify

Thanks in advance.