feat: assign node no var list tip

web/app/(commonLayout)/workflow/nodes/page.tsx

@@ -5,9 +5,9 @@ import { memo } from 'react'
 import Workflow from '@/app/components/workflow'
 import { BlockEnum } from '@/app/components/workflow/types'
 const nodes = [
-  BlockEnum.Start/* 1 */, BlockEnum.DirectAnswer/* 2 */, BlockEnum.LLM/* 3 */, BlockEnum.KnowledgeRetrieval/* 4 */, BlockEnum.QuestionClassifier/* 5 */,
+  BlockEnum.VariableAssigner/* 11 */, BlockEnum.Start/* 1 */, BlockEnum.DirectAnswer/* 2 */, BlockEnum.LLM/* 3 */, BlockEnum.KnowledgeRetrieval/* 4 */, BlockEnum.QuestionClassifier/* 5 */,
   BlockEnum.IfElse/* 6 */, BlockEnum.Code/* 7 */, BlockEnum.TemplateTransform/* 8 */, BlockEnum.HttpRequest/* 9 */, BlockEnum.Tool/* 10 */,
-  BlockEnum.VariableAssigner/* 11 */, BlockEnum.End/* 12 */,
+  BlockEnum.End/* 12 */,
 ].map((item, i) => ({
   id: `${i + 1}`,
   type: 'custom',

web/app/components/workflow/nodes/variable-assigner/components/var-list/index.tsx

 'use client'
 import type { FC } from 'react'
+import { useTranslation } from 'react-i18next'
 import React, { useCallback } from 'react'
 import produce from 'immer'
 import VarReferencePicker from '@/app/components/workflow/nodes/_base/components/variable/var-reference-picker'
@@ -17,6 +18,7 @@ const VarList: FC<Props> = ({
   list,
   onChange,
 }) => {
+  const { t } = useTranslation()
   const handleVarReferenceChange = useCallback((index: number) => {
     return (value: ValueSelector) => {
       const newList = produce(list, (draft) => {
@@ -35,6 +37,14 @@ const VarList: FC<Props> = ({
     }
   }, [list, onChange])
 
+  if (list.length === 0) {
+    return (
+      <div className='flex rounded-md bg-gray-50 items-center h-[42px] justify-center leading-[18px] text-xs font-normal text-gray-500'>
+        {t('workflow.nodes.variableAssigner.noVarTip')}
+      </div>
+    )
+  }
+
   return (
     <div className='space-y-2'>
       {list.map((item, index) => (

web/i18n/en-US/workflow.ts

@@ -92,6 +92,7 @@ const translation = {
       outputType: 'Output Type',
       outputVarType: 'Output Variable Type',
       varNotSet: 'Variable not set',
+      noVarTip: 'Add the variables to be assigned',
       type: {
         string: 'String',
         number: 'Number',

web/i18n/zh-Hans/workflow.ts

@@ -91,6 +91,7 @@ const translation = {
       outputType: '输出类型',
       outputVarType: '输出变量类型',
       varNotSet: '未设置变量',
+      noVarTip: '添加需要赋值的变量',
       type: {
         string: 'String',
         number: 'Number',