Bug#231794: Balsa Mail Client Freezes when clicking on the compose button

[nicovogel@gmx.de, 231794@bugs.debian.org]

Package: balsa
Version: 1.2.4

The Balsa Mail Client freezes when clicking on the compose button, if:
- a mail box folder is selected
- and this folder is empty and/or it is the in-box folder

Step to reproduce the bug:
1. Click on the in-box folder
2. Click on the compose button.
Balsa now should not respond to user input or TERM signals.

system spec:
kernel version: 2.4.18
libc6 version: 2.2.5-6
Debian version: 3.0 (woody)