Fix Home Assistant Template variable warning: 'dict object' has no attribute 'latest_version' when rendering '{{ value_json['update']['latest_version'] }}' error attempt 2. https://github.com/Koenkk/zigbee2mqtt/issues/15747

lib/extension/homeassistant.ts

@@ -1463,7 +1463,7 @@ export default class HomeAssistant extends Extension {
             }
         }
 
-        if (entity.isDevice() && entity.definition?.ota && !message.update?.hasOwnProperty('latest_version')) {
+        if (entity.isDevice() && entity.definition?.ota && message.update?.latest_version == null) {
             message.update = {...message.update, installed_version: -1, latest_version: -1};
         }
     }