Don't break when loading an Excel file containing a chartsheet #466
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I ran into a problem where exceljs crashed on a customer-uploaded excel file containing chartsheets. It's an entirely new concept to me, and it looks like exceljs doesn't understand those at the moment, so I chose to do a minimal fix so we don't crash, at least :)
Test case found here: http://www.excel-easy.com/examples/excel-files/chart-sheet.xlsx