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Fix issue #163: the "spans" attribute of the row element is optional #203
The "spans" attribute is not required in the "row" element. Source of information: https://msdn.microsoft.com/en-us/library/office/documentformat.openxml.spreadsheet.row.aspx
If we create a Google Sheets spreadsheet and download it as XLSX, then the "spans" attributes do not appear in the "row" elements of the worksheet.
Attached is a test xlsx file, which causes the "Cannot read property 'split' of undefined" error when trying to read it with the exceljs package.