DEV: Fix another `MessageBus::InvalidMessageTarget` error.

Follow-up to c2f2b57a9b.
2020-09-15 14:25:10 +08:00 · 2020-09-15 14:25:10 +08:00 · 49f53bdc50
parent f7438fc64b
commit 49f53bdc50
1 changed files with 7 additions and 5 deletions
--- a/app/models/topic_tracking_state.rb
+++ b/app/models/topic_tracking_state.rb
@ -438,11 +438,13 @@ SQL
    }

    channels.each do |channel, ids|
-      MessageBus.publish(
-        channel,
-        message.as_json,
-        user_ids: ids
-      )
+      if ids.present?
+        MessageBus.publish(
+          channel,
+          message.as_json,
+          user_ids: ids
+        )
+      end
    end
  end