Fix in the iteration to obtain address_scope linked to a subnet. A network can be linked to more than one subnet (ipv4 and ipv6), but if one of them does not have an address_scope, a null object element access failure occurs. (863628)

Fix in the iteration to obtain address_scope linked to a subnet. A network can be linked to more than one subnet (ipv4 and ipv6), but if one of them does not have an address_scope, a null object element access failure occurs. (863628) · Gerrit Code Review