[FIX] preventing context.get('lang')

The lang in the context can be None or False
To avoid similar error as revealed at ede29e6d, correctly retrieve the context

addons/account/wizard/account_report_common.py

@@ -35,5 +35,5 @@ class AccountCommonReport(models.TransientModel):
         data['model'] = self.env.context.get('active_model', 'ir.ui.menu')
         data['form'] = self.read(['date_from', 'date_to', 'journal_ids', 'target_move'])[0]
         used_context = self._build_contexts(data)
-        data['form']['used_context'] = dict(used_context, lang=self.env.context.get('lang', 'en_US'))
+        data['form']['used_context'] = dict(used_context, lang=self.env.context.get('lang') or 'en_US')
         return self._print_report(data)

addons/base_gengo/wizard/base_gengo_translations.py

@@ -31,7 +31,7 @@ class BaseGengoTranslations(models.TransientModel):
         res['authorized_credentials'], gengo = self.gengo_authentication()
         if 'lang_id' in fields:
             res['lang_id'] = self.env['res.lang'].search([
-                ('code', '=', self.env.context.get('lang', 'en_US'))
+                ('code', '=', self.env.context.get('lang') or 'en_US')
             ], limit=1).id
         return res
 

addons/hr_payroll/models/hr_payroll.py

@@ -567,7 +567,7 @@ class HrPayslip(models.Model):
             return res
         ttyme = datetime.fromtimestamp(time.mktime(time.strptime(date_from, "%Y-%m-%d")))
         employee = self.env['hr.employee'].browse(employee_id)
-        locale = self.env.context.get('lang', 'en_US')
+        locale = self.env.context.get('lang') or 'en_US'
         res['value'].update({
             'name': _('Salary Slip of %s for %s') % (employee.name, tools.ustr(babel.dates.format_date(date=ttyme, format='MMMM-y', locale=locale))),
             'company_id': employee.company_id.id,
@@ -616,7 +616,7 @@ class HrPayslip(models.Model):
         date_to = self.date_to
 
         ttyme = datetime.fromtimestamp(time.mktime(time.strptime(date_from, "%Y-%m-%d")))
-        locale = self.env.context.get('lang', 'en_US')
+        locale = self.env.context.get('lang') or 'en_US'
         self.name = _('Salary Slip of %s for %s') % (employee.name, tools.ustr(babel.dates.format_date(date=ttyme, format='MMMM-y', locale=locale)))
         self.company_id = employee.company_id
 

addons/website_blog/controllers/main.py

@@ -35,7 +35,7 @@ class WebsiteBlog(http.Controller):
             group['date_begin'] = start
             group['date_end'] = end
 
-            locale = request.context.get('lang', 'en_US')
+            locale = request.context.get('lang') or 'en_US'
             start = pytz.UTC.localize(fields.Datetime.from_string(start))
             tzinfo = pytz.timezone(request.context.get('tz', 'utc') or 'utc')
 

addons/website_crm/controllers/main.py

@@ -85,7 +85,7 @@ class WebsiteCrmBackend(WebsiteBackend):
         leads_graph = [{
             '0': d.strftime(DEFAULT_SERVER_DATE_FORMAT) if not previous else (d + timedelta(days=days_between)).strftime(DEFAULT_SERVER_DATE_FORMAT),
             # Respect read_group format in models.py
-            '1': daily_leads_dict.get(babel.dates.format_date(d, format='dd MMM yyyy', locale=request.env.context.get('lang', 'en_US')), 0)
+            '1': daily_leads_dict.get(babel.dates.format_date(d, format='dd MMM yyyy', locale=request.env.context.get('lang') or 'en_US'), 0)
         } for d in date_list]
 
         return leads_graph

addons/website_event/controllers/main.py

@@ -193,7 +193,7 @@ class WebsiteEventController(http.Controller):
     def get_formated_date(self, event):
         start_date = fields.Datetime.from_string(event.date_begin).date()
         end_date = fields.Datetime.from_string(event.date_end).date()
-        month = babel.dates.get_month_names('abbreviated', locale=event.env.context.get('lang', 'en_US'))[start_date.month]
+        month = babel.dates.get_month_names('abbreviated', locale=event.env.context.get('lang') or 'en_US')[start_date.month]
         return ('%s %s%s') % (month, start_date.strftime("%e"), (end_date != start_date and ("-" + end_date.strftime("%e")) or ""))
 
     @http.route('/event/get_country_event_list', type='http', auth='public', website=True)

addons/website_sale/controllers/backend.py

@@ -83,7 +83,7 @@ class WebsiteSaleBackend(WebsiteBackend):
         sales_graph = [{
             '0': d.strftime(DEFAULT_SERVER_DATE_FORMAT) if not previous else (d + timedelta(days=days_between)).strftime(DEFAULT_SERVER_DATE_FORMAT),
             # Respect read_group format in models.py
-            '1': daily_sales_dict.get(babel.dates.format_date(d, format='dd MMM yyyy', locale=request.env.context.get('lang', 'en_US')), 0)
+            '1': daily_sales_dict.get(babel.dates.format_date(d, format='dd MMM yyyy', locale=request.env.context.get('lang') or 'en_US'), 0)
         } for d in date_list]
 
         return sales_graph