生成pdf小bug修改

distributed-print-business/src/main/java/com/qmth/distributed/print/business/templete/service/impl/TaskLogicServiceImpl.java

@@ -466,7 +466,10 @@ public class TaskLogicServiceImpl implements TaskLogicService {
                 List<PdfDto> mergePdfDeleteList = new ArrayList<>();
                 mergePdfDeleteList.addAll(examStudentPdfList);
                 mergePdfDeleteList.addAll(cardPdfList);
-                basicAttachmentList.add(createPdfUtil.mergePdfSaveDb(dirNameA4, dirNameA3, tbTask, sysUser.getId(), examDetail, basicExamRule, mergePdfDeleteList));
+                BasicAttachment attachment = createPdfUtil.mergePdfSaveDb(dirNameA4, dirNameA3, tbTask, sysUser.getId(), examDetail, basicExamRule, mergePdfDeleteList);
+                if (basicAttachmentList != null) {
+                    basicAttachmentList.add(attachment);
+                }
             }
             updateExamPrintPlan(basicExamRule, examPrintPlan);
             map.computeIfAbsent("size", v -> examDetailList.size());