/**
  * Gets the number of rows per page from the form and sets it to this table
  * @return null
  */
 private function processPagination()
 {
     if (!$this->form->hasField(self::FIELD_PAGE_ROWS)) {
         return;
     }
     $number = $this->form->getValue(self::FIELD_PAGE_ROWS);
     if ($number !== null) {
         $this->setRowsPerPage($number);
     }
 }