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
I con't see the point of the @multi though, why would this ever be called from an old API context?

Also since it's called from a create() and on the result of a create(), this should always have a single record as its self.