fix: mlogbw删除bug

apps/wpm/views.py

@@ -797,7 +797,7 @@ class MlogbwViewSet(CustomModelViewSet):
     @transaction.atomic
     def perform_destroy(self, instance:Mlogbw):
         mlogb:Mlogb = instance.mlogb
-        if mlogb.material_out is not None and mlogb.wpr is not None:
+        if mlogb.material_out is not None and instance.wpr is not None:
             raise ParseError("不能删除该产出明细")
         
         ftest = instance.ftest
@@ -805,7 +805,7 @@ class MlogbwViewSet(CustomModelViewSet):
             ftest.delete()
         instance.delete()
         Mlogbw.cal_count_notok(mlogb)
-        
+
         # 如果是输入且输出追踪到个，需同步删除
         material_in: Material = mlogb.material_in
         if material_in is not None: