Blanknumber.php

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<?php
namespace Magento\Reports\Block\Adminhtml\Grid\Column\Renderer;

class Blanknumber extends \Magento\Backend\Block\Widget\Grid\Column\Renderer\Number
{
    protected function _getValue(\Magento\Framework\DataObject $row)
    {
        $data = parent::_getValue($row);
        if ($data !== null) {
            $value = $data * 1;
            return $value ? $value : ''; // fixed for showing blank cell in grid
        }
        return $this->getColumn()->getDefault();
    }
}