Row height not working in write_only mode
*Created originally on Bitbucket by [ccclarc (Chun-Chia Chen)](https://bitbucket.org/%7B8cd178a5-5a2a-4a05-961c-57ebe3f35baa%7D/)*
In write_only mode, `ws.row_dimensions[i].height` is not work.
To reproduce:
```
#!python
ROW_HEIGHT = 48
def _fill_content(ws):
for i in range(1, 4):
row = []
for col in ['AA', 'BB', 'CC']:
cell = WriteOnlyCell(ws, value='%s' % col)
row.append(cell)
ws.append(row)
ws.row_dimensions[i].height = ROW_HEIGHT
if __name__ == '__main__':
# normal
wb1 = Workbook()
ws1 = wb1.active
_fill_content(ws1)
wb1.save('1_normal.xlsx')
# write-only
wb2 = Workbook(write_only=True)
ws2 = wb2.create_sheet()
_fill_content(ws2)
wb2.save('2_write_only.xlsx')
```
issue