found some warning on maillog

[Mark Martinec]

Watthanachai Kekhua,

> Today we found some warning below, 
>   amavis[67002]: (67002-03-2) _WARN: Argument "undef" isn't numeric
>   in addition (+) at (eval 123) line 307.
> 
> My amavisd version = amavisd-new-2.7.0
> OS = FreeBSD 8.2 amd 64 bit

Are you using LDAP lookups? This looks like it is coming
from a LDAP lookup on an attribute which is supposed to
be numeric, but contains a string "undef".

If an undefined value was really intended, it should be
represented in LDAP (or in SQL) as a NULL, not some string.

  Mark