feat: add icon to graph nodes #918 (#1117)

### What problem does this PR solve?

feat: add icon to graph nodes #918

### Type of change


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

web/src/pages/flow/chat/hooks.ts

@@ -112,7 +112,7 @@ export const useSendMessage = (
       }
       const res = await send(params);
 
-      if (res?.response.status !== 200 || res?.data?.retcode !== 0) {
+      if (res && (res?.response.status !== 200 || res?.data?.retcode !== 0)) {
         antMessage.error(res?.data?.retmsg);
 
         // cancel loading