Fixed #6112 by adding isset() to checkbox value
Fixed #6112
by adding isset() to checkbox value

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