GetRows loops on empty cells but with a style
*Created by: Bagu3tte* Hello, I would like to know if there is an alternative function to `GetRows` that will only return cells with content? Example: ![image](https://user-images.githubusercontent.com/15075205/37337432-91226d9c-26b4-11e8-9f3c-9ae9ac216fe5.png) If I do a `len(GetRows("sheet1"))` on the sheet in example, the `len` function will return 1048576 instead of 2.
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