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Smarty: E_NOTICE warnings on undefined template variables

After upgrading my PHP and Smarty installations I started getting E_NOTICE warnings for any template variable that was not defined. There are valid reasons to have an undefined variable in your template, so I did not want to show a notice every time one is encountered. A real world example that I've encountered is:

{if $debug}
    Debug: {$error_string}

One could argue you could just test if $debug is non-empty, but that's more typing and feels redundant. I have a lot of old templates using this sysntax and didn't want to have to update all of them. The simple solution I found in the Smarty documentation.

// Don't show missing template variables as E_NOTICE
$smarty->error_reporting = E_ALL & ~E_NOTICE;
// or

Note: This does not mask your normal PHP E_NOTICE errors, just ones generated by Smarty.

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