Remove unused, undefined variable
Remove unused, undefined variable

make compatible with PHP 8
concrete5/concrete5,mlocati/concrete5,concrete5/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,haeflimi/concrete5,mlocati/concrete5,concrete5/concrete5,haeflimi/concrete5,concrete5/concrete5,mlocati/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,biplobice/concrete5,haeflimi/concrete5,biplobice/concrete5,biplobice/concrete5,haeflimi/concrete5