jsonrpc: Only print netaddr in getpeers when we know it

Fixes #285
Signed-off-by: Christian Decker <decker.christian@gmail.com>

lightningd/peer_control.c

@@ -842,6 +842,7 @@ static void gossipd_getpeers_complete(struct subd *gossip, const u8 *msg,
 	list_for_each(&gpa->cmd->ld->peers, p, list) {
 		json_object_start(response, NULL);
 		json_add_string(response, "state", peer_state_name(p->state));
+		if (p->addr.type != ADDR_TYPE_PADDING)
 			json_add_string(response, "netaddr",
 					type_to_string(response, struct wireaddr,
 						       &p->addr));