tests: Can't setup replication master without replication user

bitnami/mariadb/rootfs/bitnami-utils-custom.sh

@@ -74,6 +74,10 @@ configure_replication() {
 
         echo "GRANT REPLICATION SLAVE ON *.* TO '$MARIADB_REPLICATION_USER'@'%' IDENTIFIED BY '$MARIADB_REPLICATION_PASSWORD';" >> /tmp/init_mysql.sql
         echo "FLUSH PRIVILEGES ;" >> /tmp/init_mysql.sql
+      else
+        echo "In order to setup a replication master you need to provide the MARIADB_REPLICATION_USER as well"
+        echo ""
+        exit -1
       fi
       ;;
     slave)