Stock.php

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<?php
namespace Magento\ProductAlert\Block\Product\View;

class Stock extends \Magento\ProductAlert\Block\Product\View
{
    public function setTemplate($template)
    {
        if (!$this->_helper->isStockAlertAllowed() || !$this->getProduct() || $this->getProduct()->isAvailable()) {
            $template = '';
        } else {
            $this->setSignupUrl($this->_helper->getSaveUrl('stock'));
        }
        return parent::setTemplate($template);
    }
}