Sponsored issue: Object is not subscriptable

[eswhy28]

Whenever an .xlsx extension is passed, it creates an error: 'set' object is not subscriptable. This error only occurs when working with xlsx files. The code tends to loop through merged cells, and in some instances, the range is null. The library does not account for these instances.
/venv/lib/python3.10/site-packages/pyexcel_xlsx/xlsxr.py", line 72, in init
for ranges in sheet.merged_cells.ranges[:]:
TypeError: 'set' object is not subscriptable

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