Excel files with inlineStr cell types parsed as None instead of actual value in read only mode
*Created originally on Bitbucket by [whitehat2k13 (whitehat2k13 NA)](https://bitbucket.org/%7B66836148-7eee-4894-acec-e073b30499ee%7D/)* See https://github.com/kz26/PyExcelerate/issues/34#issuecomment-65230703 for reference. Expected cell values should be "col1", "col2", "col3" but iterating over the row returns None, None, None instead. Example file attached - works fine in Excel 2013. See p1598 of the ECMA OOXML reference, Part 1, 4th Edition for correct inlineStr semantics. *Attachments:* [output.xlsx](/uploads/96eedca6c141ca8365d639e235441b35/output.xlsx)
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