[exim] Make existence of SQL table optional

Hello!

In my config i have an alias_domain part in my config, which checks a
table if there are aliases in it depending on domain.

alias_domain:                                                                     driver = redirect
  allow_defer                                                                     allow_fail
  data = ${lookup mysql {MYSQL_DOMAIN_ALIAS}{$value}}                             domains = mysql;MYSQL_LOCALDOMAINS
  retry_use_local_part
  user = exim

In many cases these tables are emtpy but I need them to be created, even
if empty. Can I get a behaviour where the existence is optional so that
non existand tables are created as if the are there and empty?

Kind reagrds, Konsti

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