fix: fix the kafka of tls is nil problem

tools/component/component.go

@@ -187,13 +187,16 @@ func checkKafka(config *config.GlobalConfig) error {
 		}
 	}
 
-	tlsConfig := &kafka.TLSConfig{
+	var tlsConfig *kafka.TLSConfig
+	if config.Kafka.TLS != nil {
+		tlsConfig = &kafka.TLSConfig{
 			CACrt:              config.Kafka.TLS.CACrt,
 			ClientCrt:          config.Kafka.TLS.ClientCrt,
 			ClientKey:          config.Kafka.TLS.ClientKey,
 			ClientKeyPwd:       config.Kafka.TLS.ClientKeyPwd,
 			InsecureSkipVerify: config.Kafka.TLS.InsecureSkipVerify,
 		}
+	}
 
 	_, err = kafka.NewMConsumerGroup(&kafka.MConsumerGroupConfig{
 		KafkaVersion:   sarama.V2_0_0_0,