fix

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

@@ -527,7 +527,7 @@ public class ExportPaperUtil {
                 }
             }
             List<JSection> slist3 = getSections(qes.getQuesAnswer());
-            if (slist3 == null) {
+            if (slist3 == null||slist3.size()==0) {
                 slist3=new ArrayList<JSection>();
                 JSection sec=new JSection();
                 slist3.add(sec);