emqx/changes/ce/fix-12347.en.md

Always render valid messages for egress MQTT data bridge from the data fetched by Rule SQL, even if the data is incomplete and placeholders used in the bridge configuration are missing. Previously, some messages were rendered as invalid and were discarded by the MQTT egress data bridge.

Render undefined variables as empty strings in payload and topic templates of the MQTT egress data bridge. Previously, undefined variables were rendered as undefined strings.