docs: public synchronized boolean hasSendListeners()
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "hasSendListeners");
        boolean returnValue = false;
        if (!table.values().isEmpty())
        {
           returnValue = sendListenerIterator().hasNext();
        }
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "hasSendListeners", ""+returnValue);
        return returnValue;
     }