handle serialization of result more generically - if we cannot json dumps, then return string representation

crawler/api/app.py

@@ -94,8 +94,9 @@ async def get_task_status(
     task_id: str,
 ) -> dict[str, str]:
     task_result = listing_tasks.dump_listings_task.AsyncResult(task_id)
-    result = task_result.result
-    if type(task_result.result) is TaskRevokedError:
+    try:
+        result = json.dumps(task_result.result)
+    except:
         result = str(task_result.result)
 
     return {