Impacted versions: 9.0 (I've seen similar behaviour on 10.0 and 11.0 but haven't found a reproducable way yet)

Steps to reproduce:
1. Deinstall `marketing_campaign`
2. Reinstall `marketing_campaign`
3. After a few seconds you'll see the page to select your theme but it simply shows `False` and you can't choose a theme. You're also 'stuck' on this page:
![image](https://user-images.githubusercontent.com/6352350/34411180-5c321bd8-ebd5-11e7-931c-ab5faac1402d.png)
**Note:** You can only do this once per database so be sure to test it on a clean runbot / test instance

Current behavior: You're stuck on the page and can't choose the theme.

Expected behavior: Either you're able to choose your theme (again) or Odoo skips the page.


addons/theme_bootswatch/__openerp__.py
{
    'name': 'Bootswatch Theme',
    'summary': 'Support for Bootswatch themes in master',
    'description': 'This theme module is exclusively for master to keep the support of Bootswatch themes which were previously part of the website module in 8.0.',
    'category': 'Website',
    'sequence': 900,
    'version': '1.0',
    'depends': ['website'],
    'data': [
        'views/theme.xml',
    ],
    'images': ['static/description/bootswatch.png'],
    'application': False,
}