fix dead code warning

app/__init__.py

@@ -480,10 +480,11 @@ def make_task(app):
                     )
                 )
 
-        def on_failure(self, exc, task_id, args, kwargs, einfo=None):
+        def on_failure(self, exc, task_id, args, kwargs, einfo):
 
             # enables request id tracing for these logs
             with self.app_context():
+                app.logger.debug(f"einfo is {einfo}")
                 app.logger.exception(
                     "Celery task {task_name} (queue: {queue_name}) failed".format(
                         task_name=self.name,