JAMES-3502, set keystore Optional.empty() as default (client cert authentication)
diff --git a/backends-common/rabbitmq/src/main/java/org/apache/james/backends/rabbitmq/RabbitMQConfiguration.java b/backends-common/rabbitmq/src/main/java/org/apache/james/backends/rabbitmq/RabbitMQConfiguration.java
index 96957a0..89da884 100644
--- a/backends-common/rabbitmq/src/main/java/org/apache/james/backends/rabbitmq/RabbitMQConfiguration.java
+++ b/backends-common/rabbitmq/src/main/java/org/apache/james/backends/rabbitmq/RabbitMQConfiguration.java
@@ -205,6 +205,7 @@
                     this.sslValidationStrategy = sslValidationStrategy;
                     this.hostNameVerifier = hostNameVerifier;
                     this.sslTrustStore = sslTrustStore;
+                    this.sslKeyStore = Optional.empty();
                 }
 
                 public ReadyToBuild sslKeyStore(Optional<SSLKeyStore> sslKeyStore) {