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If I were you, I would check this:

before this line:

$this->smarty->assign($data);

check if $order_details have correct data, check if there are date_from and date_to

Then in your tpl use dump function and dump like this:

{dump($order_details)}

Check if this has the valid values you are looking for

If I were you, I check this:

before this line:

$this->smarty->assign($data);

check if $order_details have correct data, check if there are date_from and date_to

Then in your tpl use dump function and dump like this:

{dump($order_details)}

Check if this has the valid values you are looking for