fix: improve output check (#6638)

* fix: simplify output check and add debug logging in ContentDisplay component

* fix: remove unnecessary console log in ContentDisplay component

src/frontend/src/components/core/chatComponents/ContentDisplay.tsx

@@ -209,7 +209,7 @@ export default function ContentDisplay({
             language="json"
             code={JSON.stringify(content.tool_input, null, 2)}
           />
-          {content.output !== undefined && (
+          {content.output && (
             <>
               <Markdown
                 remarkPlugins={[remarkGfm]}