Failing to parse formatting.
*Created originally on Bitbucket by [StephenGore](https://bitbucket.org/%7Bd659ccaa-d11c-47ed-882a-a03838d00153%7D/)* I have recently attempted to open a worksheet and an error occurred in the content property of "Cell\Text.py". The error is "TypeError: sequence item 3: expected str instance, NoneType found". After taking a look in the sharedstrings.xml I found the error happened when parsing the following XML. ``` #!XML <si> <r> <t>“Replaced Data”</t> </r> <r> <rPr> <sz val="11"/> <color rgb="FF008080"/> <rFont val="Calibri"/> <family val="2"/> <scheme val="minor"/> </rPr> <t/> </r> </si> ``` I think it is to do with the "<t/>" tag and not finding any data. More information at http://stackoverflow.com/questions/34094049/failing-to-open-spreadsheet/
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