Pan is crashing when retrieving messages with an empty mime attachement.
Examination of the contents of the message cache shows a mime attachement
header for a text description with no contents as shown in the segment below.
Adding an extra blank line (contents) resolves the problem.

------------1074465019400B08FB29687
Content-Type:text/plain;
Content-Transfer-Encoding: 7bit

------------1074465019400B08FB29687
Content-Type: image/jpeg;