jxtn.core.axi/src/java/util/IteratorExt.java: modify nextOfMax/nextOfMin.. to avoid null analysis warnings
jxtn.core.axi/src/java/util/IteratorExt.java: modify nextOfMax/nextOfMin.. to avoid null analysis warnings

SkyLandTW/JXTN,AqD/JXTN,SkyLandTW/JXTN