return if serviceNotReady while creating topic (#336)

pulsar-broker/src/main/java/com/yahoo/pulsar/broker/service/BrokerService.java

@@ -472,6 +472,7 @@ public class BrokerService implements Closeable, ZooKeeperCacheListener<Policies
             String msg = String.format("Namespace is being unloaded, cannot add topic %s", topic);
             log.warn(msg);
             topicFuture.completeExceptionally(new ServiceUnitNotReadyException(msg));
+            return;
         }
 
         getManagedLedgerConfig(destinationName).thenAccept(config -> {

pulsar-testclient/src/main/java/com/yahoo/pulsar/testclient/utils/FixedColumnLengthTableMaker.java

+/**
+ * Copyright 2016 Yahoo Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.yahoo.pulsar.testclient.utils;
 
 import java.util.Objects;