Fix the IP address check to allow for interfaces that just have a IPv6 address but no IPv4
Fix the IP address check to allow for interfaces that just have a IPv6 address but no IPv4

ptorsten/pfsense,dennypage/pfsense,NOYB/pfsense,pfsense/pfsense,phil-davis/pfsense,ch1c4um/pfsense,pfsense/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,ch1c4um/pfsense,NOYB/pfsense,ch1c4um/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,jxmx/pfsense,NewEraCracker/pfsense,pfsense/pfsense,brunostein/pfsense,dennypage/pfsense,jxmx/pfsense,NOYB/pfsense,pfsense/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,jxmx/pfsense,BlackstarGroup/pfsense,BlackstarGroup/pfsense,brunostein/pfsense,dennypage/pfsense,dennypage/pfsense,brunostein/pfsense,ch1c4um/pfsense,ptorsten/pfsense,phil-davis/pfsense,NewEraCracker/pfsense