[IMP] sales_team : assign the Sales channel on salesmen creation

Purpose
=======

When a new sales user is created, user is not in any team. The dashboard doesn't make any sense and he wouldn't know how to start working

Specification
=============

On salesman creation, the user should be assign to a Sales channel IF there is only one sales team of this type.

addons/sales_team/models/res_users.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import fields, models
+from odoo import api, fields, models
 
 
 class ResUsers(models.Model):
@@ -10,3 +10,13 @@ class ResUsers(models.Model):
     sale_team_id = fields.Many2one(
         'crm.team', 'Sales Channel',
         help='Sales Channel the user is member of. Used to compute the members of a sales channel through the inverse one2many')
+
+    @api.model
+    def create(self, vals):
+        # Assign the new user in the sales team if there's only one sales team of type `Sales`
+        user = super(ResUsers, self).create(vals)
+        if user.has_group('sales_team.group_sale_salesman') and not user.sale_team_id:
+            teams = self.env['crm.team'].search([('team_type', '=', 'sales')])
+            if len(teams.ids) == 1:
+                user.sale_team_id = teams.id
+        return user