From 6fc1e233772afb464585cb09816e2106f32d9752 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Praszmo?= <michalpr@cert.pl>
Date: Wed, 27 Dec 2023 07:06:55 +0100
Subject: [PATCH] Fix issues with register_tasks and empty tasklist

---
 karton/core/backend.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/karton/core/backend.py b/karton/core/backend.py
index b235c0d..3045b9d 100644
--- a/karton/core/backend.py
+++ b/karton/core/backend.py
@@ -544,6 +544,10 @@ def register_tasks(self, tasks: List[Task]) -> None:
         Register or update multiple tasks in Redis.
         :param tasks: List of task objects
         """
+        # calling mset with an empty dictionary results in a crash
+        if not tasks:
+            return
+
         taskmap = {
             f"{KARTON_TASK_NAMESPACE}:{task.uid}": task.serialize() for task in tasks
         }