fix: 修复人员未分配部门时获取部门信息错误问题

ruoyi-flowable/src/main/java/com/ruoyi/flowable/service/impl/FlowTaskServiceImpl.java

@@ -825,7 +825,7 @@ public class FlowTaskServiceImpl extends FlowServiceFactory implements IFlowTask
                         SysUser sysUser = sysUserService.selectUserById(Long.parseLong(histIns.getAssignee()));
                         flowTask.setAssigneeId(sysUser.getUserId());
                         flowTask.setAssigneeName(sysUser.getNickName());
-                        flowTask.setDeptName(sysUser.getDept().getDeptName());
+                        flowTask.setDeptName(Objects.nonNull(sysUser.getDept()) ? sysUser.getDept().getDeptName() : "");
                     }
                     // 展示审批人员
                     List<HistoricIdentityLink> linksForTask = historyService.getHistoricIdentityLinksForTask(histIns.getTaskId());