[MlMt] r5757 Attachments and Commands

[Raza Rizvi]

Hi,

I noted this first in r5726 - if you try and save an attachment from an 
email by clicking on the folder icon on the attachment bar, MailMail 
crashes (OSX 10.14.6). You can preview the attachment and then if it is 
a PDF, open Preview, then save from there.

Also if you select more than 1 message and do Commands/Change subject, 
MailMate will crash. Do them one at a time, then there is no issue.

These are only small niggles.

Raza