Fix check for bind_address

The empty string is a valid setting for the bind_address option, so
explicitly check for None here instead.

Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/app/federation_sender.py b/synapse/app/federation_sender.py

index 8092fd316c..23aae8a09c 100644
--- a/synapse/app/federation_sender.py
+++ b/synapse/app/federation_sender.py
@@ -93,7 +93,7 @@ class FederationSenderServer(HomeServer):
 
         root_resource = create_resource_tree(resources, Resource())
 
-        if bind_address:
+        if bind_address is not None:
             bind_addresses.append(bind_address)
 
         for address in bind_addresses:
@@ -118,7 +118,7 @@ class FederationSenderServer(HomeServer):
                 bind_address = listener.get("bind_address", None)
                 bind_addresses = listener.get("bind_addresses", [])
 
-                if bind_address:
+                if bind_address is not None:
                     bind_addresses.append(bind_address)
 
                 for address in bind_addresses: