#713 Argument "" isn't numeric errors after switching to MySQL4

[Eugene Mah]

Before: I was running POPFile on a Win2k machine using
MySQL 3.23 as a backend on a Solaris server (Sparc20).
Used ActiveState Perl 5.8.3 instead of the bundled
Perl interpreter. Ran flawlessly (although a little
slow) with no messages in the console window aside from
the normal startup messages.

Now: Still running POPFile on the same Win2k machine,
although now using MySQL 4.0.20 as a backend on a
Fedora Core 2 machine (Dell Optiplex GX270). Using
ActiveState Perl 5.8.4 instead of the bundled Perl
interpreter.

I'm now seeing numerous errors of the form

Argument "" isn't numeric in numeric eq (==) at
c:\progra~1\popfile/Classifier/Bayes.pm line 2296,
<GEN31> line 67.

appearing in the POPFile console window whenever a
message is processed. POPFile appears to be processing
my email without problem. Mail appears to be getting
filtered and labelled appropriately. The part reading
"<GEN31> line 67" changes with each message processed.