Remplacer cellule vide excel PHPExcel

//ajouter excel

   if(isset($_FILES['doc'])){
      $errors= array();
      $file_name =mssql_escape_string($_FILES['doc']['name']);
      $file_size =mssql_escape_string($_FILES['doc']['size']);
      $file_tmp  =mssql_escape_string($_FILES['doc']['tmp_name']);
      $file_type =mssql_escape_string($_FILES['doc']['type']);
      $file_ext  =mssql_escape_string(strtolower(end(explode('.',$_FILES['doc']['name']))));
      
      $expensions= mssql_escape_string(array("xlsx"));
      
      if(in_array($file_ext,$expensions)=== false){
         $errors[]="extension not allowed, please choose a xlsx file.";
      }
      
      if($file_size > 2097152){
         $errors[]='File size must be excately 2 MB';
      }

         $file_tmp =$_FILES['doc']['tmp_name'];

               move_uploaded_file($file_tmp,"doc/".$file_name);

  
set_include_path(get_include_path() . PATH_SEPARATOR . 'Classes/'); 
include 'PHPExcel/IOFactory.php';
// This is the file path to be uploaded.
$inputFileName = 'doc/'.$file_name; 

try {
    $objPHPExcel = PHPExcel_IOFactory::load($inputFileName);
} catch(Exception $e) {
    die('Error loading file "'.pathinfo($inputFileName,PATHINFO_BASENAME).'": '.$e->getMessage());
}

$allDataInSheet = $objPHPExcel->getActiveSheet()->toArray(true,true,true,true);
$arrayCount = count($allDataInSheet);  // Here get total count of row in that Excel sheet


for($i=2;$i<=$arrayCount;$i++){
$universite   =mssql_escape_string(trim($allDataInSheet[$i]["A"]));
$nom_etab     =mssql_escape_string(trim($allDataInSheet[$i]["B"]));
$ville        =mssql_escape_string(trim($allDataInSheet[$i]["C"]));
$addresse_etab=mssql_escape_string(trim($allDataInSheet[$i]["D"]));
$mail_etab    =mssql_escape_string(trim($allDataInSheet[$i]["E"]));
$tel          =mssql_escape_string(trim($allDataInSheet[$i]["F"]));
$statut_etab  =mssql_escape_string(trim($allDataInSheet[$i]["G"]));


$insertTable= mysql_query("insert into etablissement (nom_etab,statut_etab,mail_etab,addresse_etab,universite,ville,tel) 
values('".$nom_etab."','".$statut_etab."','".$mail_etab."', '".$addresse_etab."', '".$universite."', '".$ville."', '".$tel."');");

}}
?>