[fix][broker]fix missing return when internalGetReplicatedSubscriptio…

…nStatus (apache#19054)

### Motivation

Fix missing `return null` if throw any exception when `internalGetReplicatedSubscriptionStatus`

### Modifications

Add `return null` when handing exception in `internalGetReplicatedSubscriptionStatus`.

pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java

@@ -5226,6 +5226,7 @@ protected void internalGetReplicatedSubscriptionStatus(AsyncResponse asyncRespon
                                                 clientAppId(), topicName, subName, t);
                                         asyncResponse.resume(new RestException(t));
                                     }
+                                    return null;
                                 }
                                 asyncResponse.resume(status);
                                 return null;