Problem.php

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<?php
namespace Magento\Newsletter\Block\Adminhtml;

use Magento\Newsletter\Model\ResourceModel\Problem\Collection;

class Problem extends \Magento\Backend\Block\Template
{
    protected $_template = 'Magento_Newsletter::problem/list.phtml';

    protected $_problemCollection;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        Collection $problemCollection,
        array $data = []
    ) {
        $this->_problemCollection = $problemCollection;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        parent::_construct();

        $collection = $this->_problemCollection->addSubscriberInfo()->addQueueInfo();
    }

    protected function _prepareLayout()
    {
        $this->setChild(
            'deleteButton',
            $this->getLayout()->createBlock(
                \Magento\Backend\Block\Widget\Button::class,
                'del.button'
            )->setData(
                ['label' => __('Delete Selected Problems'), 'onclick' => 'problemController.deleteSelected();']
            )
        );

        $this->setChild(
            'unsubscribeButton',
            $this->getLayout()->createBlock(
                \Magento\Backend\Block\Widget\Button::class,
                'unsubscribe.button'
            )->setData(
                ['label' => __('Unsubscribe Selected'), 'onclick' => 'problemController.unsubscribe();']
            )
        );
        return parent::_prepareLayout();
    }

    public function getUnsubscribeButtonHtml()
    {
        return $this->getChildHtml('unsubscribeButton');
    }

    public function getDeleteButtonHtml()
    {
        return $this->getChildHtml('deleteButton');
    }

    public function getShowButtons()
    {
        return $this->_problemCollection->getSize() > 0;
    }
}