fix: mlogdefect 空列表时仍同步继承缺陷

前端传 mlogdefect: [] 时，原 is not None 判断会走进 need_mdfect 分支，
既不创建真实缺陷也跳过 sync_inherited_defect，导致 mlogb 无任何缺陷标识。
改为无论哪个分支都兜底调用 sync_inherited_defect，由其内部判断互斥。

apps/wpm/serializers.py

@@ -478,8 +478,7 @@ class MlogSerializer(CustomModelSerializer):
                 if mlogb_defect_objects:
                     MlogbDefect.objects.bulk_create(mlogb_defect_objects)
                 mlogb.cal_count_notok(cal_mlog=False)
-            else:
-                mlogb.sync_inherited_defect(cal_count=True)
+            mlogb.sync_inherited_defect(cal_count=True)
         instance.cal_mlog_count_from_mlogb()
         return instance
 
@@ -570,7 +569,7 @@ class MlogSerializer(CustomModelSerializer):
             mox.save()
             Mlogb.objects.filter(mlog=instance, material_out__isnull=False).exclude(id=mox.id).delete()
             if need_mdefect:
-                MlogbDefect.objects.filter(mlogb__mlog=instance).delete()
+                MlogbDefect.objects.filter(mlogb__mlog=instance, is_inherited=False).delete()
                 mlogb_defect_objects = [
                     MlogbDefect(**{**item, "mlogb": mox, "id": idWorker.get_id()})
                     for item in mlogdefect if item["count"] > 0
@@ -578,8 +577,7 @@ class MlogSerializer(CustomModelSerializer):
                 if mlogb_defect_objects:
                     MlogbDefect.objects.bulk_create(mlogb_defect_objects)
                 mox.cal_count_notok(cal_mlog=False)
-            else:
-                mox.sync_inherited_defect(cal_count=True)
+            mox.sync_inherited_defect(cal_count=True)
         instance.cal_mlog_count_from_mlogb()
         return instance