Bug#289646: kbabel: crash with some .po file

[Frans Pop <aragorn@tiscali.nl>]

I've also been having crashes using kbabel in Sarge (see #289646). I've 
had crashes with several po files now.

The behavior is somewhat eratic: when I first had the crash, I could 
always reproduce it, now I find that sometimes the crash does not happen.
Very likely my crashes are related to this BR.

The tag 'sid' for this bug is probably _not_ correct!

||/ Name                          Version
+++-=============================-=======
ii  kbabel                        3.3.1-2
ii  kdelibs                       3.3.1-4
ii  kdelibs4                      3.3.1-4