修复文件ossbug全部改用ossId二次请求方式

ruoyi-system/src/main/java/com/ruoyi/workflow/service/impl/WfProcessServiceImpl.java

@@ -390,6 +390,7 @@ public class WfProcessServiceImpl extends FlowServiceFactory implements IWfProce
             HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery()
                 .processInstanceId(task.getProcessInstanceId())
                 .singleResult();
+            if (Objects.nonNull(historicProcessInstance)) {}
             Long userId = Long.parseLong(historicProcessInstance.getStartUserId());
             String nickName = userService.selectNickNameById(userId);
             flowTask.setStartUserId(userId);