Patch to fix a base64 decode error in Scrubber

[scoggins]

The base64 decode of attachments isn't always checked
to see if an exception was raised. Call were placed
around one of the get_payload() calls, so i removed
that one and put a try/except in the _bdecode()
function. I also removed a redunent if not s: return s
in there too.

This is a fix for bug
http://sourceforge.net/tracker/index.php?func=detail&aid=691039&group_id=103&atid=100103

[scoggins (scoggins-users)]

The file base64.patch was added: Fix for bug #691039

[twouters (twouters)]

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This doesn't really belong in Mailman, it's more of an email
(the module) problem. I've sent in a bugreport to the
appropriate place, leaving this patch and the bug open until
it's fixed. (If it is; if it isn't, we need to wrap
get_payload in the appropriate try/except, which might be a
good idea anyway.)

[bwarsaw (bwarsaw)]

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I've fixed this in the email.Message class, so I don't think
we need to add a try/except to Scrubber.