Fix web search and template max tokens (#1564)

### What problem does this PR solve?


### Type of change

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

graph/component/duckduckgo.py

@@ -44,7 +44,7 @@ class DuckDuckGo(ComponentBase, ABC):
         ans = self.get_input()
         ans = " - ".join(ans["content"]) if "content" in ans else ""
         if not ans:
-            return DuckDuckGo.be_output(self._param.no)
+            return DuckDuckGo.be_output("")
 
         if self._param.channel == "text":
             with DDGS() as ddgs:
@@ -57,6 +57,9 @@ class DuckDuckGo(ComponentBase, ABC):
                 duck_res = [{"content": '<a href="' + i["url"] + '">' + i["title"] + '</a>    ' + i["body"]} for i in
                             ddgs.news(ans, max_results=self._param.top_n)]
 
+       if not duck_res:
+           return DuckDuckGo.be_output("")
+
         df = pd.DataFrame(duck_res)
-        print(df, ":::::::::::::::::::::::::::::::::")
+        if DEBUG: print(df, ":::::::::::::::::::::::::::::::::")
         return df