PHP 8 combability

not compatible to PHP 8

[08-Jun-2022 05:07:11 UTC] PHP Warning: Undefined array key “action” in /var/www/xxxxxxxx.com/news/wp-content/themes/sparkling-child/functions.php on line 62

Reported here: https://colorlibsupport.com/t/php-8-0-error-log-message/32486