[imp] Zero-length attachments

[Roger B.A. Klorese]

> > That's a good location for it.
> >
> > A better one would be in the Horde INSTALL file, as well as 
> directly 
> > in the horde/conf.php file where the example of IMP 
> authentication is 
> > given.
> 
> Patch?
> 
> (Done in my best Chuck impersonation)

I'll try, though "Stewardess, I don't speak diff...."