only do trust tree key checking if there were actually any keys provided
only do trust tree key checking if there were actually any keys provided


NLnetLabs/ldns,benlaurie/ldns,NLnetLabs/ldns,threatstack/libldns,benlaurie/ldns,benlaurie/ldns,threatstack/libldns,NLnetLabs/ldns,threatstack/libldns,gegenschall/ldns,threatstack/libldns,gegenschall/ldns,gegenschall/ldns,NLnetLabs/ldns,gegenschall/ldns,threatstack/libldns,benlaurie/ldns