Zero-Index Cells Corrupting Workbooks
*Created originally on Bitbucket by [griffinskudder (Griffin Skudder)](https://bitbucket.org/%7Be3afff79-caf8-4f9d-a885-44b5e05419cb%7D/)* I've attached some code and test data that demonstrates the problem. The issue boils down to two things, first, assigning an instance of cell to a variable when row=0 and/or column=0 does not throw an exception to sys.stderr. Second, saving a workbook that has had a cell with row=0 or column=0 accessed still completes even though an exception is thrown. In cases where column=0, the entire newly saved workbook is corrupted and cannot be recovered by Excel. Where row=0 an error will be shown by Excel but data is able to be recovered. *Attachments:* [openpyxlBug.py](/uploads/f007313904deb6ef775fb28faa26631b/openpyxlBug.py)[workbook.xlsx](/uploads/22c6248d39b5e3d34bd0df169cea9c45/workbook.xlsx)
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