Input fails on message with inline attachments

[pemontto]

The IMAP input fails to parse emails with inline attachments. It defaults to grabbing the first mail part if the content type doesn't match and tries to decode that part.

part = mail.parts.find { |p| p.content_type.match @content_type_re } || mail.parts.first
message = part.decoded

With inline attachments and in a few other cases that results in this message and an unprocessed email:

Encountered error NoMethodError {:message=>"Can not decode an entire message, try calling #decoded on the various fields and body or parts if it is a multipart message.",