fix issue #1244 (NPE in LogicalOggStreamImpl) (#1480)
fix issue #1244 (NPE in LogicalOggStreamImpl) (#1480)


zzuegg/jmonkeyengine,jMonkeyEngine/jmonkeyengine,jMonkeyEngine/jmonkeyengine,jMonkeyEngine/jmonkeyengine,jMonkeyEngine/jmonkeyengine,zzuegg/jmonkeyengine,zzuegg/jmonkeyengine,zzuegg/jmonkeyengine