Return NULL when captive portal is not enabled
Return NULL when captive portal is not enabled

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