Impossible to add a predefined chart style to charts created with openpyxl

Created originally on Bitbucket by laurent chriqui

I use a script to create a chart and add a title to the chart. The file opens well in excel but when I try to apply a defined style to it, it corrupts the file which can no longer be saved.

If I delete the title in excel I can then save the file successfully.

Attached a sample script and resulting excel file.

Attachments: scratch_4.py SampleChart.xlsx

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