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
It might be a good idea to use `resolve_2many_commands` here, instead of blindly assuming it's a 0-command (or a 6-command, or whatever's being assumed here)