[FIX] account: don't allow to user remove the company

When a user creates a journal entry in accounting and the company is empty or
not selected in that journal entry, an error is generated.

 step to reproduce -
 - install the `Invoicing` & `Inventory`.
 - open the `Invoicing`.
 - create New.
 - open  `other info` note page > company (company_id) must be empty.
 - the error will be generated.

Error-ValueError:
          Expected singleton: res. company()

If the user attempts to remove the company after this commit, they get a
validation error.

sentry-4558397052

closes odoo/odoo#144982

X-original-commit: baa6153bd25a794f432e1a8665098479b33b6e8e
Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>

addons/account/i18n/account.pot

@@ -11947,6 +11947,15 @@ msgstr ""
 msgid "Select specific invoice and delivery addresses"
 msgstr ""
 
+#. module: account
+#. odoo-python
+#: code:addons/account/models/account_move.py:0
+#, python-format
+msgid ""
+"We can't leave this document without any company. Please select a company "
+"for this document."
+msgstr ""
+
 #. module: account
 #: model_terms:ir.ui.view,arch_db:account.res_config_settings_view_form
 msgid ""

addons/account/models/account_move.py

@@ -1668,6 +1668,11 @@ class AccountMove(models.Model):
 
     @api.onchange('company_id')
     def _inverse_company_id(self):
+        for move in self:
+            # This can't be caught by a python constraint as it is only triggered at save and the compute method that
+            # needs this data to be set correctly before saving
+            if not move.company_id:
+                raise ValidationError(_("We can't leave this document without any company. Please select a company for this document."))
         self._conditional_add_to_compute('journal_id', lambda m: (
             not m.journal_id.filtered_domain(self.env['account.journal']._check_company_domain(m.company_id))
         ))