Replaced isEqualTo(null) with isNull()

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rabbitmq/TbRabbitMqNodeTest.java

@@ -103,7 +103,7 @@ public class TbRabbitMqNodeTest {
         assertThat(config.getExchangeNamePattern()).isEqualTo("");
         assertThat(config.getRoutingKeyPattern()).isEqualTo("");
         assertThat(config.getMessageProperties()).isNull();
-        assertThat(config.getHost()).isEqualTo(null);
+        assertThat(config.getHost()).isNull();
         assertThat(config.getPort()).isEqualTo(ConnectionFactory.DEFAULT_AMQP_PORT);
         assertThat(config.getVirtualHost()).isEqualTo(ConnectionFactory.DEFAULT_VHOST);
         assertThat(config.getUsername()).isEqualTo(ConnectionFactory.DEFAULT_USER);