PHPExcel到html给出了空单元格

Im Using the PHPExcel library to convert a uploaded .xlsx file to a html page.

The code works but the html page also has alot of empty cells in it. what can i do so PHPExcel wil not create these?

the convert

$inputFileName = $upload_dir;
$objPHPExcel = PHPExcel_IOFactory::load($inputFileName);
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'HTML');
$objWriter->save($basename.".html");

the result