refactor(BlindStructuresServiceImpl): 注释掉删除历史等级失败的处理逻辑

- 注释掉了 BlindStructuresServiceImpl 类中的删除历史

ruoyi-modules/ruoyi-system/src/main/java/org/dromara/business/service/impl/BlindStructuresServiceImpl.java

@@ -250,9 +250,9 @@ public class BlindStructuresServiceImpl implements IBlindStructuresService {
 
             // 3. 删除原有等级数据
             Boolean b = blindLevelsService.deleteBlindLevelByBlindStructureId(update.getId());
-            if (!b) {
+           /* if (!b) {
                 return R.fail("删除历史等级失败");
-            }
+            }*/
 
             // 5. 插入新等级数据
             for (BlindLevelsImportVo vo : dataList) {