Impacted versions:
10.0

Steps to reproduce:
Install `l10n_jp` and configure a company to use this chart of account in the menu `Accounting > Settings`

Current behavior:

Error is thrown:
```python
Traceback (most recent call last):
  File "/opt/odoo/src/odoo/http.py", line 638, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/opt/odoo/src/odoo/http.py", line 675, in dispatch
    result = self._call_function(**self.params)
  File "/opt/odoo/src/odoo/http.py", line 331, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/opt/odoo/src/odoo/service/model.py", line 119, in wrapper
    return f(dbname, *args, **kwargs)
  File "/opt/odoo/src/odoo/http.py", line 324, in checked_call
    result = self.endpoint(*a, **kw)
  File "/opt/odoo/src/odoo/http.py", line 933, in __call__
    return self.method(*args, **kw)
  File "/opt/odoo/src/odoo/http.py", line 504, in response_wrap
    response = f(*args, **kw)
  File "/opt/odoo/src/addons/web/controllers/main.py", line 866, in call_button
    action = self._call_kw(model, method, args, {})
  File "/opt/odoo/src/addons/web/controllers/main.py", line 854, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/opt/odoo/src/odoo/api.py", line 681, in call_kw
    return call_kw_multi(method, model, args, kwargs)
  File "/opt/odoo/src/odoo/api.py", line 672, in call_kw_multi
    result = method(recs, *args, **kwargs)
  File "/opt/odoo/src/odoo/addons/base/res/res_config.py", line 537, in execute
    getattr(self, method)()
  File "/opt/odoo/src/addons/account/models/res_config.py", line 261, in set_chart_of_accounts
    wizard.execute()
  File "/opt/odoo/src/addons/account/models/chart_template.py", line 821, in execute
    acc_template_ref, taxes_ref = self.chart_template_id._install_template(company, code_digits=self.code_digits, transfer_account_id=self.transfer_account_id)
  File "/opt/odoo/src/addons/account/models/chart_template.py", line 280, in _install_template
    tmp1, tmp2 = self._load_template(company, code_digits=code_digits, transfer_account_id=transfer_account_id, account_ref=acc_ref, taxes_ref=taxes_ref)
  File "/opt/odoo/src/addons/account/models/chart_template.py", line 336, in _load_template
    self.generate_fiscal_position(taxes_ref, account_ref, company)
  File "/opt/odoo/src/addons/account/models/chart_template.py", line 455, in generate_fiscal_position
    'position_id': new_fp
  File "/opt/odoo/src/addons/account/models/chart_template.py", line 350, in create_record_with_xmlid
    new_xml_id = str(company.id)+'_'+template_xmlid.name
TypeError: cannot concatenate 'str' and 'bool' objects
```

Expected behavior:

Chart of account is correctly configured for the desired company

Video/Screenshot link (optional):
![selection_012](https://cloud.githubusercontent.com/assets/8102312/22685563/148b11b2-ed21-11e6-97e4-1a88049eddfa.jpg)

cash_account_code_prefix = fields.Char('Cash Accounts Prefix')
    code_digits = fields.Integer(string='# of Digits', required=True, help="No. of Digits to use for account code")
    sale_tax_id = fields.Many2one('account.tax.template', string='Default Sales Tax', oldname="sale_tax")
    purchase_tax_id = fields.Many2one('account.tax.template', string='Default Purchase Tax', oldname="purchase_tax")
    sale_tax_rate = fields.Float(string='Sales Tax(%)')
    use_anglo_saxon = fields.Boolean(string='Use Anglo-Saxon Accounting', related='chart_template_id.use_anglo_saxon')
    transfer_account_id = fields.Many2one('account.account.template', required=True, string='Transfer Account',
        domain=lambda self: [('reconcile', '=', True), ('user_type_id.id', '=', self.env.ref('account.data_account_type_current_assets').id)],
        help="Intermediary account used when moving money from a liquidity account to another")
    purchase_tax_rate = fields.Float(string='Purchase Tax(%)')
    complete_tax_set = fields.Boolean('Complete Set of Taxes',
        help="This boolean helps you to choose if you want to propose to the user to encode the sales and purchase rates or use "
            "the usual m2o fields. This last choice assumes that the set of tax defined for the chosen template is complete")
    @api.model
    def _get_chart_parent_ids(self, chart_template):
        """ Returns the IDs of all ancestor charts, including the chart itself.
            (inverse of child_of operator)
            :param browse_record chart_template: the account.chart.template record
            :return: the IDS of all ancestor charts, including the chart itself.
        """
        result = [chart_template.id]
        while chart_template.parent_id:
            chart_template = chart_template.parent_id
            result.append(chart_template.id)
        return result
    @api.onchange('sale_tax_rate')
    def onchange_tax_rate(self):
        self.purchase_tax_rate = self.sale_tax_rate or False
    @api.onchange('chart_template_id')
    def onchange_chart_template_id(self):