From ae87e1e77fc515764c8de2218a86abf7ba40cf44 Mon Sep 17 00:00:00 2001
From: Stefano Gallotti <sgallotti@expediagroup.com>
Date: Wed, 17 Nov 2021 17:31:56 -0800
Subject: [PATCH] add default to external_topic_distribution

---
 faust/assignor/client_assignment.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/faust/assignor/client_assignment.py b/faust/assignor/client_assignment.py
index 3b1205f23..218ed528f 100644
--- a/faust/assignor/client_assignment.py
+++ b/faust/assignor/client_assignment.py
@@ -149,7 +149,7 @@ class ClientMetadata(
     assignment: ClientAssignment
     url: str
     changelog_distribution: HostToPartitionMap
-    external_topic_distribution: HostToPartitionMap
+    external_topic_distribution: HostToPartitionMap = cast(HostToPartitionMap, {})
     topic_groups: Mapping[str, int] = cast(Mapping[str, int], None)
 
     def __post_init__(self) -> None: