[FIX] hr_payroll_account: onchange_contract_id

If there is no contract then the default journal_id must be set.
PS: The field "journal_id" in "hr.contract" model is not required.

opw:667093

addons/hr_payroll_account/hr_payroll_account.py

@@ -60,7 +60,7 @@ class hr_payslip(osv.osv):
     def onchange_contract_id(self, cr, uid, ids, date_from, date_to, employee_id=False, contract_id=False, context=None):
         contract_obj = self.pool.get('hr.contract')
         res = super(hr_payslip, self).onchange_contract_id(cr, uid, ids, date_from=date_from, date_to=date_to, employee_id=employee_id, contract_id=contract_id, context=context)
-        journal_id = contract_id and contract_obj.browse(cr, uid, contract_id, context=context).journal_id.id or False
+        journal_id = contract_id and contract_obj.browse(cr, uid, contract_id, context=context).journal_id.id or (not contract_id and self._get_default_journal(cr, uid, context=None))
         res['value'].update({'journal_id': journal_id})
         return res