Master event issues fix mba

- Task: https://www.odoo.com/web#id=10364&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.T0iVg37yu5OWKTH3
Well mostly it'll blow up with an error when accessing e.g. `self.origin` as that one'll do an implicit `ensure_one()`