fix: conditionally render FieldListContainer based on inputFields length

web/app/components/rag-pipeline/components/input-field/field-list/index.tsx

@@ -45,6 +45,7 @@ const FieldList = ({
           <RiAddLine className='h-4 w-4 text-text-tertiary' />
         </ActionButton>
       </div>
+      {inputFields.length > 0 && (
         <FieldListContainer
           className='flex flex-col gap-y-1 px-4 pb-2'
           inputFields={inputFields}
@@ -53,6 +54,7 @@ const FieldList = ({
           onListSortChange={handleListSortChange}
           readonly={readonly}
         />
+      )}
       {showInputFieldEditor && (
         <InputFieldEditor
           show={showInputFieldEditor}