fix(oa/erp/task): 新增临时任务参数校验逻辑

1. 新增任务标题非空校验
2. 新增计划开始/完成时间、实际需求部门非空校验
3. 简化时间先后校验逻辑，移除冗余的非空判断

ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpTempTaskServiceImpl.java

@@ -582,6 +582,9 @@ public class ErpTempTaskServiceImpl implements IErpTempTaskService {
         if (bo == null) {
             throw new ServiceException("临时任务数据不能为空");
         }
+        if (StringUtils.isBlank(bo.getTaskTitle())) {
+            throw new ServiceException("任务标题不能为空");
+        }
         if (StringUtils.isBlank(bo.getTaskDesc())) {
             throw new ServiceException("任务描述不能为空");
         }
@@ -589,14 +592,22 @@ public class ErpTempTaskServiceImpl implements IErpTempTaskService {
         if (StringUtils.isBlank(bo.getTaskType())) {
             throw new ServiceException("任务类型不能为空");
         }
+        if (bo.getPlanStartTime() == null) {
+            throw new ServiceException("计划开始时间不能为空");
+        }
+        if (bo.getPlanEndTime() == null) {
+            throw new ServiceException("计划完成时间不能为空");
+        }
+        if (bo.getRealRequestDeptId() == null) {
+            throw new ServiceException("实际需求部门不能为空");
+        }
         if ("3".equals(bo.getTaskType()) && bo.getProjectId() == null) {
             throw new ServiceException("项目任务必须关联具体项目");
         }
         if ("1".equals(bo.getTaskType()) && bo.getDeptId() == null) {
             throw new ServiceException("部门任务必须明确归属部门");
         }
-        if (bo.getPlanStartTime() != null && bo.getPlanEndTime() != null
-            && bo.getPlanEndTime().before(bo.getPlanStartTime())) {
+        if (bo.getPlanEndTime().before(bo.getPlanStartTime())) {
             throw new ServiceException("计划完成时间不能早于计划开始时间");
         }
     }