Maia Digest Sender Perl Warnings

I've recently upgraded most software on my servers and both Maia and Perl got a hit ;P

Anyways as of a few days ago I keep(kept) getting mails to the admin account with
defined(%hash) is deprecated at line 144.
        (Maybe you should just omit the defined()?)
Found this quite annoying so I fixed the issue and created a patch :)
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