Update app.py

app.py

@@ -351,11 +351,11 @@ class IssueManager:
              "body": issue_data.get('body', ''),
              "state": issue_data.get('state', 'unknown'),
              "labels": sorted([label['name'] for label in issue_data.get('labels', [])]),
-             "assignee": issue_data.get('assignee', {}).get('login') if issue_data.get('assignee') else None,
+             "assignee": issue_data.get('assignee', '').get('login') if issue_data.get('assignee') else None,
              "url": issue_data.get('html_url', '#'),
              "created_at": issue_data.get('created_at'),
              "updated_at": issue_data.get('updated_at'),
-         }
+         }}
 
     async def crawl_issues(self, repo_url: str, github_token: Optional[str], hf_token: Optional[str]) -> Tuple[List[List], go.Figure, str, go.Figure]:
         """