fixed bug arround [UdpReplicator-1] ERROR net.openhft.collections.UdpReplicator -
                  java.lang.NullPointerException
                  	at net.openhft.collections.UdpReplicator.enableWrites(UdpReplicator.java:230)
                  	at net.openhft.collections.UdpReplicator.process(UdpReplicator.java:144)
                  	at net.openhft.collections.UdpReplicator.access$100(UdpReplicator.java:54)
                  	at net.openhft.collections.UdpReplicator$1.run(UdpReplicator.java:117)
                  	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
                  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
                  	at java.lang.Thread.run(Thread.java:744)