added check for initial empty missing_acks list
added check for initial empty missing_acks list

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