Fix some logs

Author: tulir

libgm/event_handler.go

@@ -185,10 +185,13 @@ func (c *Client) HandleRPCMsg(rawMsg *gmproto.IncomingRPCMessage) {
 	if c.sessionHandler.receiveResponse(msg) {
 		return
 	}
-	c.Logger.Debug().
-		Stringer("message_action", msg.Message.Action).
+	logEvt := c.Logger.Debug().
 		Str("message_id", msg.ResponseID).
-		Msg("Received message")
+		Stringer("bugle_route", msg.BugleRoute)
+	if msg.Message != nil {
+		logEvt.Stringer("message_action", msg.Message.Action)
+	}
+	logEvt.Msg("Received message")
 	switch msg.BugleRoute {
 	case gmproto.BugleRoute_PairEvent:
 		c.handlePairingEvent(msg)

libgm/session_handler.go

@@ -130,9 +130,11 @@ func (s *SessionHandler) receiveResponse(msg *IncomingRPCMessage) bool {
 	delete(s.responseWaiters, requestID)
 	s.responseWaitersLock.Unlock()
 	evt := s.client.Logger.Debug().
-		Stringer("message_action", msg.Message.Action).
 		Str("request_message_id", requestID).
 		Str("response_message_id", msg.ResponseID)
+	if msg.Message != nil {
+		evt.Stringer("message_action", msg.Message.Action)
+	}
 	if s.client.Logger.GetLevel() == zerolog.TraceLevel {
 		if msg.DecryptedData != nil {
 			evt.Str("data", base64.StdEncoding.EncodeToString(msg.DecryptedData))