Fix: Fixed the issue that the content of the Dropdown section cannot be seen when selecting the next operator #3221 (#8918)

…be seen when selecting the next operator #3221

### What problem does this PR solve?
Fix: Fixed the issue that the content of the Dropdown section cannot be
seen when selecting the next operator #3221

### Type of change

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

web/src/pages/agent/constant.tsx

@@ -320,6 +320,11 @@ export const initialCategorizeValues = {
   parameter: ModelVariableType.Precise,
   message_history_window_size: 1,
   category_description: {},
+  outputs: {
+    category_name: {
+      type: 'string',
+    },
+  },
 };
 
 export const initialMessageValues = {