[FIX] l10n_de, l10n_mx, l10n_nl: bad command sent to ORM

When we get the existing tags to append them a new id, we don't get a
list of id but a list of tuple with one id, this only append if you have
more than one accounting of these country installed, as the first time
it will return an empty list. So the command sent to the ORM, is not
built correctly.

To fix this we just append commands '4' that will be append in a list.

addons/l10n_de/models/chart_template.py

@@ -9,8 +9,8 @@ class AccountChartTemplate(models.Model):
     def _prepare_transfer_account_for_direct_creation(self, name, company):
         res = super(AccountChartTemplate, self)._prepare_transfer_account_for_direct_creation(name, company)
         xml_id = self.env.ref('l10n_de.tag_de_asset_bs_B_III_2').id
-        existing_tags = [x[-1:] for x in res.get('tag_ids', [])]
-        res['tag_ids'] = [(6, 0, existing_tags + [xml_id])]
+        res.setdefault('tag_ids', [])
+        res['tag_ids'].append((4, xml_id))
         return res
 
     # Write paperformat and report template used on company

addons/l10n_mx/models/chart_template.py

@@ -45,6 +45,6 @@ class AccountChartTemplate(models.Model):
     def _prepare_transfer_account_for_direct_creation(self, name, company):
         res = super(AccountChartTemplate, self)._prepare_transfer_account_for_direct_creation(name, company)
         xml_id = self.env.ref('l10n_mx.account_tag_102_01').id
-        existing_tags = [x[-1:] for x in res.get('tag_ids', [])]
-        res['tag_ids'] = [(6, 0, existing_tags + [xml_id])]
+        res.setdefault('tag_ids', [])
+        res['tag_ids'].append((4, xml_id))
         return res

addons/l10n_nl/models/account_chart_template.py

@@ -18,6 +18,6 @@ class AccountChartTemplate(models.Model):
     def _prepare_transfer_account_for_direct_creation(self, name, company):
         res = super(AccountChartTemplate, self)._prepare_transfer_account_for_direct_creation(name, company)
         xml_id = self.env.ref('l10n_nl.account_tag_25').id
-        existing_tags = [x[-1:] for x in res.get('tag_ids', [])]
-        res['tag_ids'] = [(6, 0, existing_tags + [xml_id])]
+        res.setdefault('tag_ids', [])
+        res['tag_ids'].append((4, xml_id))
         return res