Impacted versions: 11.0

Steps to reproduce: Just test on [Runbot](http://289106-11-0-b95622.runbot13.odoo.com/web?debug=1#id=&view_type=form&model=res.config.settings&action=110&menu_id=4) --> Uninstall website module --> Go to the Configuration page for any module > Make any changes and save it.

Current behavior: [Odoo Server Error - Validation Error]


![](https://image.prntscr.com/image/Gx3lGxX4Qg6lsxAhGxL5SQ.png)

Even the field which was added by website module (website_id) is also not removed from the database.

![](https://image.prntscr.com/image/Wn1C8lPdTg6frBLga0ZVqQ.png)

Expected behavior: Configuration should be applied.

Video/Screenshot link (optional):


addons/website/models/res_config_settings.py
if not self.has_google_analytics:
            self.has_google_analytics_dashboard = False
        if not self.has_google_analytics:
            self.google_analytics_key = False
    @api.onchange('has_google_analytics_dashboard')
    def onchange_has_google_analytics_dashboard(self):
        if not self.has_google_analytics_dashboard:
            self.google_management_client_id = False
            self.google_management_client_secret = False
    @api.onchange('language_ids')
    def _onchange_language_ids(self):
        
        
        if self.language_ids and self.default_lang_id not in self.language_ids:
            self.default_lang_id = self.language_ids[0]
    @api.depends('language_ids')
    def _compute_language_count(self):
        for config in self:
            config.language_count = len(self.language_ids)
    @api.model
    def get_values(self):