Can't save a write-only workbook with worksheet tables.
*Created originally on Bitbucket by [Tim](https://bitbucket.org/%7B585af067-5b46-4068-8052-597a4f9b8a24%7D/)* I want to add a table to a write-only workbook, but upon saving the workbook, I get this error: ``` TypeError: 'WriteOnlyWorksheet' object is not subscriptable ``` The bug happens in `/openpyxl/worksheet/_writer.py` in line 269 in the method `write_tables(self)`: ```py row = self.ws[table.ref][0] ``` The docs don't state that it wouldn't be possible to add tables to a write-only workbook, so I guess it's a bug then. This is the code I'm using: ```py wb = openpyxl.Workbook(write_only=True) ws: openpyxl.worksheet.worksheet.Worksheet = wb.create_sheet() df = pandas.DataFrame(data) for row in openpyxl.utils.dataframe.dataframe_to_rows(df, index=False, header=True): ws.append(row) ref = _get_ref(df) # some function to obtain a valid excel reference table = openpyxl.worksheet.table.Table(displayName='tbl', ref=ref) table.tableStyleInfo = openpyxl.worksheet.table.TableStyleInfo(name="TableStyleLight1", showFirstColumn=False, showLastColumn=False, showRowStripes=True, showColumnStripes=False) ws.add_table(table) wb.save('test.xlsx') ``` Is there any way to work around this? I'm using openpyxl v3.0.3
issue