PHP 8.0/8.1 compatibility error when activating an extension/module for a company

[rkilchmn]

FA 2.4.14 using PHP 8.1.6:

When activating an extension/module for a company I get this error:
mysqli_set_charset(): Passing null to parameter #2 ($charset) of type string is deprecated in file: /usr/share/webapps/frontaccounting/includes/db/connect_db_mysqli.inc at line 298

my temporary fix:
function db_set_charset($db, $charset)
{
global $db;

if (!empty( $charset)) {  // <--------------- fix
	return mysqli_set_charset($db, $charset);
}

}