[sale] Sale Calendar Issue

- Task: https://www.odoo.com/web/#id=8411&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.PvjYdFX70QJTQioP
@rma-odoo Please configure your code editor in order to avoid diffs on blank lines or whitespaces... this creates a "noise diff". Thanks