[MlMt] Rules sometimes don't move messages

[Randall Gellens]

I'm running Mailmate version 1.13.2 (5673), which I think is the latest 
release version.  One of my rules adds a tag and moves the message to a 
different IMAP folder.  Lately, I've noticed that it unpredictably and 
randomly but repeatedly fails to perform the move.  It does apply the 
tag, so I know it activated.  I don't see any errors in the Activity 
Viewer, but the errors might have been hours ago.  I checked 
/tmp/mailmate_logs, but the only file there is 
mailmate_parser_problems.log which reports some non-compliant message 
content.

--Randall