openpyxl can't open workbook that contains chart using non ascii in axis number format
*Created originally on Bitbucket by [marcos_meteogrid (Marcos Sánchez Provencio - Meteogrid)](https://bitbucket.org/%7Bac1d42d6-a169-47f7-bdc4-3383873659c7%7D/)*
Bug created along with pull request #190
*Attachments:* [xxx.xlsx](/uploads/06bf39fd7ebea0e1a33ea37e307e180b/xxx.xlsx)
issue