if (subs == null) return null;
if (subs == null) { return null; }   if (log.isTraceEnabled()) { log.trace("Removing durable sub: " + subscriptionName); }
   public DurableSubscriptionHolder removeDurableSubscription(String clientID,                                                              String subscriptionName)   {      Map subs = (Map)subscriptions.get(clientID);            if (subs == null) return null;            DurableSubscriptionHolder removed = (DurableSubscriptionHolder)subs.remove(subscriptionName);            if (subs.size() == 0)      {         subscriptions.remove(clientID);      }            return removed;   }