Fix "Undefined variable $serverLabel" warning in php 8+
Fix "Undefined variable $serverLabel" warning in php 8+

In php 8 or newer a number of notices have been converted into warnings. See for more details: https://www.php.net/manual/en/migration80.incompatible.php
On the landing page the following warning is thrown into the title: "Warning: Undefined variable $serverLabel in ib/tpl/main.php on line 17"
ptrofimov/beanstalk_console,pentium10/beanstalk_console,ptrofimov/beanstalk_console,pentium10/beanstalk_console,pentium10/beanstalk_console,ptrofimov/beanstalk_console