[PATCH] Fix a segfault with old config and configure issue

[Helmut Schaa]

Hi,

Am Freitag, 31. August 2007 19:44:51 schrieb Robert Buchholz:
> You fixed the segfault yourself two days before. So you can either
> revert my first patch or your fix from before [1], because now
> (_vpnService == NULL) is checked twice.

I know ;)

I'll keep both patches in SVN as mine is the more obvious check but 
calling "isValid" is nevertheless a good idea.

Thanks,
Helmut