Handle case with no server or no client OpenVPN
Handle case with no server or no client OpenVPN

If there are OpenVPN servers but not clients, this warning is emitted:
Warning: Invalid argument supplied for foreach() in /etc/rc.openvpn on line 55
This fixes handles that case, and the case of OpenVPN clients but no servers.
ch1c4um/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,pfsense/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,dennypage/pfsense,ch1c4um/pfsense,jxmx/pfsense,pfsense/pfsense,ch1c4um/pfsense,ptorsten/pfsense,ptorsten/pfsense,dennypage/pfsense,NOYB/pfsense,jxmx/pfsense,pfsense/pfsense,pfsense/pfsense,brunostein/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,dennypage/pfsense,jxmx/pfsense,brunostein/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,dennypage/pfsense,phil-davis/pfsense,NOYB/pfsense,brunostein/pfsense,BlackstarGroup/pfsense,NOYB/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,BlackstarGroup/pfsense