Merge branch 'dev_v2.2.0' into release_v2.2.0

distributed-print/src/main/java/com/qmth/distributed/print/api/ExamDetailController.java

@@ -201,7 +201,11 @@ public class ExamDetailController {
             printPlanIdList = new ArrayList<>();
         }
         List<Long> idList = printPlanIdList.stream().map(SystemConstant::convertIdToLong).collect(Collectors.toList());
-        Map<String, Object> map = tbTaskService.saveTask(TaskTypeEnum.EXAMINATION_EXPORT, idList.get(0));
+        Long printId = null;
+        if (idList.size() > 0){
+            printId = idList.get(0);
+        }
+        Map<String, Object> map = tbTaskService.saveTask(TaskTypeEnum.EXAMINATION_EXPORT, printId);
         map.put("printPlanIdList", idList);
         map.put("courseCode", courseCode);
         map.put("paperNumber", paperNumber);