Impacted versions: 11c, 11e

Steps to reproduce: Install module, uninstall it, then go to action choise delete module (tested with some module: Automated Translations through Gengo API, Vietnam - Accounting...)

Current behavior:
Popup error:
```
The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: Module Uninstallation - base.module.uninstall]
```
--
logs:
```
ERROR: null value in column "module_id" violates not-null constraint
DETAIL:  Failing row contains (1, t, null, 1, 2017-11-06 09:26:04.803957, 1, 2017-11-06 09:26:04.803957).
CONTEXT:  SQL statement "UPDATE ONLY "public"."base_module_uninstall" SET "module_id" = NULL WHERE $1 OPERATOR(pg_catalog.=) "module_id""
```

If module is not installed before, no error occurs

Expected behavior: the module should delete normally
"""
        Return the action linked to an ir.actions.todo is there exists one that
        should be executed. Otherwise, redirect to /web
        """
        Todos = self.env['ir.actions.todo']
        _logger.info('getting next %s', Todos)
        active_todo = Todos.search([('state', '=', 'open')], limit=1)
        if active_todo:
            _logger.info('next action is %s', active_todo)
            return active_todo.action_launch()
        return {
            'type': 'ir.actions.act_url',
            'target': 'self',
            'url': '/web',
        }
    @api.multi
    def _button_immediate_function(self, function):