Bug#1057387: openresolv: Garbles nameserver address for no apparent reason

[Roy Marples]

openresolv-3.16.2 will no longer restore resolv.conf.bak to resolv.conf if it 
had nothing to write to resolv.conf

rationale: resolvconf is still in charge and an empty resolv.conf is the 
correct thing to do with no information.

Roy