added simple check to see if the target dest is still in the membership (https://issues.jboss.org/browse/JGRP-1274)
added simple check to see if the target dest is still in the membership (https://issues.jboss.org/browse/JGRP-1274)

ligzy/JGroups,rpelisse/JGroups,deepnarsay/JGroups,rpelisse/JGroups,TarantulaTechnology/JGroups,ibrahimshbat/JGroups,TarantulaTechnology/JGroups,belaban/JGroups,pferraro/JGroups,vjuranek/JGroups,rvansa/JGroups,Sanne/JGroups,rhusar/JGroups,dimbleby/JGroups,rhusar/JGroups,Sanne/JGroups,rhusar/JGroups,kedzie/JGroups,pruivo/JGroups,TarantulaTechnology/JGroups,Sanne/JGroups,danberindei/JGroups,dimbleby/JGroups,ligzy/JGroups,vjuranek/JGroups,ligzy/JGroups,pruivo/JGroups,dimbleby/JGroups,slaskawi/JGroups,slaskawi/JGroups,rpelisse/JGroups,ibrahimshbat/JGroups,rvansa/JGroups,pruivo/JGroups,tristantarrant/JGroups,danberindei/JGroups,kedzie/JGroups,slaskawi/JGroups,pferraro/JGroups,danberindei/JGroups,ibrahimshbat/JGroups,deepnarsay/JGroups,vjuranek/JGroups,belaban/JGroups,tristantarrant/JGroups,deepnarsay/JGroups,ibrahimshbat/JGroups,belaban/JGroups,kedzie/JGroups,pferraro/JGroups