[PHP 8.2] Creation of dynamic property Smarty_Variable::$do_else is deprecated

[MrPetovan]

Sample log entry:

PHP Deprecated:  Creation of dynamic property Smarty_Variable::$do_else is deprecated in smarty3/compiled/00/79/f3/0079f327cf7c99b7c784ade960290cb254503dbd_2.file.group_side.tpl.php on line 59

PHP Watch entry: https://php.watch/versions/8.2/dynamic-properties-deprecated

In the case of Smarty, this looks straightforward, the Smarty_Variable can receive the explicit declaration of the following properties currently declared dynamically:

• key (string?)
• show (bool)
• iteration (int)
• index (int)
• do_else (bool)
• first (bool)
• last (bool)
• total (int)

I'd do it but I'm unfamiliar with most of these properties so I wouldn't be able to write the correct documentation for each property.

[MrPetovan]

This seems to have been addressed in #775