[CDBI] Patch to Class::DBI.pm to avoid warning on stringification

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Hi,

I'm getting the following error filling up my Apache logs:

Use of uninitialized value in join or string at /usr/local/lib/perl5/ 
site_perl/5.8.6/Class/DBI.pm line 47.

This happens on the stringification of classes.  The following patch  
quiets things down:

$ diff DBI.pm.orig DBI.pm
47c47
<       return join "/", $self->get(@cols);
---
 >       return join "/", map { defined $_ ? $_ : '' } $self->get 
(@cols);

Does that look reasonable?  I believe that this would need to be sent  
directly to the maintainer as he doesn't follow this list (?), but I  
wanted to run it by the list first to see if it looks like the best  
solution.

ky

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