Allowing comment for empty cell (Attribute NoneType)

Created originally on Bitbucket by megavolts

Today, I got the following error "AttributeError: 'NoneType' object has no attribute 'read'" when saving a file I opened with keep_vba=False.

The error comes from empty cells that have a comment, e.g. Sheet S_ice, Cell J6, K6, L6. Adding text/number within the cell fixed the problem.

I propose to allow comment for empty cells.

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