[IMP] payment: Set automatically a default value for journal_id if not set

Purpose
=======

The field journal_id on a payment.acquired is required on the view. The only issue is that the journals cannot be created before having installed a localization. When the payment acquire module is installed before the localization, the journal id is not set on the payment acquire and it's impossible to make a call to `write` (For example publish the acquire)

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

When making a write or a create on a payment acquire, udpate the journal_id with a default value if not set.

addons/payment/models/payment_acquirer.py

@@ -185,13 +185,22 @@ class PaymentAcquirer(models.Model):
     @api.model
     def create(self, vals):
         image_resize_images(vals)
+        vals = self._check_journal_id(vals)
         return super(PaymentAcquirer, self).create(vals)
 
     @api.multi
     def write(self, vals):
         image_resize_images(vals)
+        vals = self._check_journal_id(vals)
         return super(PaymentAcquirer, self).write(vals)
 
+    def _check_journal_id(self, vals):
+        if not vals.get('journal_id', False):
+            default_journal = self.env['account.journal'].search([('type', '=', 'bank')], limit=1)
+            if default_journal:
+                vals.update({'journal_id': default_journal.id})
+        return vals
+
     @api.multi
     def toggle_website_published(self):
         self.write({'website_published': not self.website_published})

addons/payment/views/payment_views.xml

@@ -88,7 +88,7 @@
                                     <field name="fees_dom_var" attrs="{'invisible': [('fees_active', '=', False)]}"/>
                                     <field name="fees_int_fixed" attrs="{'invisible': [('fees_active', '=', False)]}"/>
                                     <field name="fees_int_var" attrs="{'invisible': [('fees_active', '=', False)]}"/>
-                                    <field name="journal_id" context="{'default_type': 'bank'}" required="1"/>
+                                    <field name="journal_id" context="{'default_type': 'bank'}"/>
                                     <field name="specific_countries"/>
                                     <field name="country_ids" widget="many2many_tags" attrs="{'invisible': [('specific_countries', '=', False)]}"/>
                                     <label for="view_template_id" groups="base.group_no_one"/>