[syslog-ng]Preventing syslog-ng from halting if a source is not found

I am having difficulty trying to setup syslog-ng to continue running if a source is not found. Right now I have it scanning /dev/log and /var/chroot/named/dev/log on my Linux system. In some cases the /var/chroot/named/dev/log will not exist on some systems I have here. Is there a way I can setup the configuration file to say if /var/chroot/named/dev/log doesn't exist to simply ignore it and not look for logs there at all? Right now syslog-ng refuses to start if it doesn't exist. -Nick