feat: build nodes and edges from chat bot dsl #918 (#1372)

### What problem does this PR solve?
feat: build nodes and edges from chat bot dsl #918


### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/flow/retrieval-form/index.tsx

@@ -2,8 +2,9 @@ import KnowledgeBaseItem from '@/components/knowledge-base-item';
 import Rerank from '@/components/rerank';
 import SimilaritySlider from '@/components/similarity-slider';
 import TopNItem from '@/components/top-n-item';
+import { useTranslate } from '@/hooks/commonHooks';
 import type { FormProps } from 'antd';
-import { Form } from 'antd';
+import { Form, Input } from 'antd';
 import { IOperatorForm } from '../interface';
 
 type FieldType = {
@@ -19,6 +20,7 @@ const onFinishFailed: FormProps<FieldType>['onFinishFailed'] = (errorInfo) => {
 };
 
 const RetrievalForm = ({ onValuesChange, form }: IOperatorForm) => {
+  const { t } = useTranslate('flow');
   return (
     <Form
       name="basic"
@@ -37,6 +39,13 @@ const RetrievalForm = ({ onValuesChange, form }: IOperatorForm) => {
       <TopNItem></TopNItem>
       <Rerank></Rerank>
       <KnowledgeBaseItem></KnowledgeBaseItem>
+      <Form.Item
+        name={'empty_response'}
+        label={t('emptyResponse', { keyPrefix: 'chat' })}
+        tooltip={t('emptyResponseTip', { keyPrefix: 'chat' })}
+      >
+        <Input.TextArea placeholder="" rows={4} />
+      </Form.Item>
     </Form>
   );
 };