sheet_to_html does not handle blank sheets gracefully #2835

Currently, sheet_to_html fails when it attempts to parse a blank sheet because the decode_range helper function does not find the !ref key within the ws object (because it is empty).

Because there is not a book_to_html function, I'm using the sheet_to_html function to parse multiple sheets in a workbook, but some may be empty. Can we update the sheet_to_html function to do a null check on the sheet and return early?

Sure, and other methods should also check null object or missing worksheet range.

In the case of sheet_to_html, is it preferable to throw an error or generate an empty table?

Thanks! I think generating an empty table makes sense.