bugfix:

【产品参数模版】新建操作，只选择产品信息后其他不是必填项的不输入信息点击保存，报错，无法新建成功

src/views/technology/productParam/components/user-edit.vue

@@ -297,7 +297,7 @@
         produceVersionId: '',
         moldingAgent: '',
 
-        palletId: '',
+        palletId: null,
         palletName: '',
         palletCode: '',
         palletSpecification: '',