[BUG] wrong treatment of subject headers with only one character

Hello,

I encountered the following behavior:

If the subject of a new article I write contains only one character  
or one number, tin treat this subject as empty and refuses posting  
(inews_prog set to --internal) or strips the subject header from the  
article (inews_prog set to an external inews).

This happens at least with tin-1.9.3 and the latest snapshot.

Can anyone else reproduce this?

Dennis