fix no resualt bugs (#1448)

### What problem does this PR solve?

### Type of change

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

graph/component/baidu.py

@@ -57,6 +57,6 @@ class Baidu(ComponentBase, ABC):
                      in zip(url_res, title_res, body_res)]
         del body_res, url_res, title_res
 
-        br = pd.DataFrame(baidu_res, columns=['content'])
-        print(">>>>>>>>>>>>>>>>>>>>>>>>>>\n", br)
-        return br
+        print(baidu_res, ":::::::::::::::::::::::::::::::::")
+        return Baidu.be_output(baidu_res)
+

graph/component/duckduckgosearch.py

@@ -57,6 +57,5 @@ class DuckDuckGoSearch(ComponentBase, ABC):
                 duck_res = ['<a href="' + i["url"] + '">' + i["title"] + '</a>    ' + i["body"] for i in
                             ddgs.news(ans, max_results=self._param.top_n)]
 
-        dr = pd.DataFrame(duck_res, columns=['content'])
-        print(">>>>>>>>>>>>>>>>>>>>>>>>>>\n", dr)
-        return dr
+        print(duck_res, ":::::::::::::::::::::::::::::::::")
+        return DuckDuckGoSearch.be_output(duck_res)

graph/component/message.py

@@ -46,7 +46,11 @@ class Message(ComponentBase, ABC):
         return Message.be_output(random.choice(self._param.messages))
 
     def stream_output(self):
+        res = None
         if self._param.messages:
-            yield {"content": random.choice(self._param.messages)}
+            res = {"content": random.choice(self._param.messages)}
+            yield res
+
+        self.set_output(res)