Before this commit, when trying to remove a format of a
`data-oe-zws-empty-inline` of an empty block, the attribute was added to
that block and would never be removed. Also, unformatting a zws would
not remove the zws from the dom.
How to reproduce the original bug:
- put the selection inside an emtpy p
- ctrl+b (in windows/linux) or cmd+b (in mac)
=> The zws attribute data-oe-zws-empty-inline is added on the P rather
than creating a span.
- The next letter that will be typed will not be bold but should be
bold
- That attribute should not exists in a block, that could lead to
unexpected bug
task-3628480
closesodoo/odoo#148659
X-original-commit: 7b7e343e7b4fd5bab4f41eeead85dedbf2ab717d
Signed-off-by: Geelen Sébastien (sge) <sge@odoo.com>