bug#10377: 23.3; unrmail fails to produce any output for a empty BABYL folder

[Mark Lillibridge]

ts-rhel5 [128]% ls
RMAIL

ts-rhel5 [129]% cat RMAIL 
BABYL OPTIONS: -*- rmail -*-
Version: 5
Labels:
Note:   This is the header of an rmail file.
Note:   If you are seeing it in rmail,
Note:    it means the file has no messages in it.
                                                            
ts-rhel5 [131]% ~/bin/emacs-23.3-install/bin/emacs -batch -f batch-unrmail 
RMAIL 
Writing messages to /home/mdl/Tmp/now/RMAIL.mail...
Writing messages to /home/mdl/Tmp/now/RMAIL.mail...done
Done

ts-rhel5 [132]% ls
RMAIL


    There should be a RMAIL.mail file of 0 bytes above as promised by
the output messages.  This file is correctly created by the version of
unrmail in Emacs 22 and for non-empty folders by Emacs 23 unrmail.

- Mark