fix

examcloud-core-questions-service/src/main/java/cn/com/qmth/examcloud/core/questions/service/util/ExportPaperUtil.java

@@ -530,6 +530,8 @@ public class ExportPaperUtil {
             if (slist3 == null||slist3.size()==0) {
                 slist3=new ArrayList<JSection>();
                 JSection sec=new JSection();
+                List<SectionElement> ses=new ArrayList<SectionElement>();
+                sec.setElements(ses);
                 slist3.add(sec);
             }
             SectionElement se = new SectionElement();