[Evolution] Empty Message asks for confirmation when closing

[Patrick O'Callaghan <pocallaghan gmail com>]

Message->Mailing List->Post Message to List opens a composer with the
To: header set to the list address. If you then close the message
without entering any content, you get a dialogue asking "Are you sure
you want to discard this message?".

This also used to happen when composing with Mail->New Message, until it
was fixed in a recent update. I guess someone forgot the Post-to-List
case. Could that be because it's not much used?

poc