*: event, website_blog, website_event, website_forum, website_sale,
website_sale_comparison
We're changing most of the "DRAG BUILDING BLOCK HERE" placeholders so
that they only appear on drag. Making the preview as close as possible
to the page once saved. However, we're still keeping them on empty pages
because it make sense there to let know that the area is editable.
Part of https://github.com/odoo/odoo/pull/47933
task-2210733
Co-authored-by: qsm-odoo <qsm@odoo.com>
