Fix: some agent bug (#14829)

### What problem does this PR solve?

fix: 
update null checks to use 'is None' for better clarity
replace RAGFlowSelect with SelectWithSearch in DebugContent
add max height and overflow to DialogContent in ParameterDialog
 remove unused types from DataOperationsForm

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/component/message.py

@@ -161,7 +161,7 @@ class Message(ComponentBase):
             if k in kwargs:
                 continue
             v = v["value"]
-            if not v:
+            if v is None:
                 v = ""
             ans = ""
             if isinstance(v, partial):

agent/component/string_transform.py

@@ -105,7 +105,7 @@ class StringTransform(Message, ABC):
                 pass
 
         for k,v in kwargs.items():
-            if not v:
+            if v is None:
                 v = ""
             script = re.sub(k, lambda match: v, script)
 

web/src/pages/agent/debug-content/index.tsx

@@ -1,4 +1,5 @@
 import MarkdownContent from '@/components/next-markdown-content';
+import { SelectWithSearch } from '@/components/originui/select-with-search';
 import { ButtonLoading } from '@/components/ui/button';
 import {
   Form,
@@ -9,7 +10,6 @@ import {
   FormMessage,
 } from '@/components/ui/form';
 import { Input } from '@/components/ui/input';
-import { RAGFlowSelect } from '@/components/ui/select';
 import { Switch } from '@/components/ui/switch';
 import { Textarea } from '@/components/ui/textarea';
 import { IMessage } from '@/interfaces/database/chat';
@@ -147,7 +147,7 @@ const DebugContent = ({
               <FormItem className="flex-1">
                 <FormLabel>{props.label}</FormLabel>
                 <FormControl>
-                  <RAGFlowSelect
+                  <SelectWithSearch
                     allowClear
                     options={
                       q.options?.map((x) => ({
@@ -156,7 +156,7 @@ const DebugContent = ({
                       })) ?? []
                     }
                     {...field}
-                  ></RAGFlowSelect>
+                  ></SelectWithSearch>
                 </FormControl>
                 <FormMessage />
               </FormItem>

web/src/pages/agent/form/begin-form/parameter-dialog.tsx

@@ -210,7 +210,7 @@ export function ParameterDialog({
 
   return (
     <Dialog open onOpenChange={hideModal}>
-      <DialogContent>
+      <DialogContent className="max-h-[80vh] overflow-y-auto">
         <DialogHeader>
           <DialogTitle>{t('flow.variableSettings')}</DialogTitle>
         </DialogHeader>

web/src/pages/agent/form/data-operations-form/index.tsx

@@ -9,11 +9,7 @@ import { memo } from 'react';
 import { useForm, useWatch } from 'react-hook-form';
 import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
-import {
-  JsonSchemaDataType,
-  Operations,
-  initialDataOperationsValues,
-} from '../../constant';
+import { Operations, initialDataOperationsValues } from '../../constant';
 import { useFormValues } from '../../hooks/use-form-values';
 import { useWatchFormChange } from '../../hooks/use-watch-form-change';
 import { INextOperatorForm } from '../../interface';
@@ -94,7 +90,6 @@ function DataOperationsForm({ node }: INextOperatorForm) {
         <QueryVariableList
           tooltip={t('flow.queryTip')}
           label={t('flow.query')}
-          types={[JsonSchemaDataType.Object]}
         ></QueryVariableList>
         <Separator />
         <RAGFlowFormItem name="operations" label={t('flow.operations')}>