Missing NULL pointer check in MessageConsumer::autoAcknowledge

When you call consumer->receive() on empty queue receive method returns NULL message but before return MessageConsumer::autoAcknowledge method is invoked. This method doesn't check message against NULL, this cause coredump is message is NULL.

Patch:
p<IMessage> MessageConsumer::autoAcknowledge(p<IMessage> message)
{
try
{
if ( message != NULL )

{ // <------ Check NULL here !!!!! // Is the message an ActiveMQMessage? (throws bad_cast otherwise) p<ActiveMQMessage> activeMessage = p_dyncast<ActiveMQMessage> (message) ; // Register the handler for client acknowledgment activeMessage->setAcknowledger( smartify(this) ) ; if( acknowledgementMode != ClientAckMode ) doAcknowledge(activeMessage) ; }

}
catch( bad_cast& bc )

{ // ignore }

return message ;