Ensure cookie exists before checking its content
Ensure cookie exists before checking its content

Corrects a undefined index error that appears with some versions of php

CON-In-A-Box/ConComSignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/CIAB-SignIn