打包 空指针异常修复

modules/i3plus-ext-mes-pcn-apiservice/src/main/java/cn/estsh/i3plus/ext/mes/pcn/apiservice/serviceimpl/step/MesPackageNoGenerateStepService.java

@@ -456,6 +456,7 @@ public class MesPackageNoGenerateStepService extends BaseStepService implements
                                                                                      MesPackage packageDb, List<String> productSnList2Cur, Boolean isSealed) {
         //当前未满包的包装条码明细数据
         List<MesPackageDataContext> resultList = null;
+        if (CollectionUtils.isEmpty(productSnList2Cur)) return resultList;
         //包装条码明细ID
         Long detailId = null;
         //遍历当前满足标包的差额条码