[FIX] website_sale: fix traceback when selecting a product in website

This traceback arises when the user selects a product in website.

To reproduce this issue:

1) Install 'website_sale'
2) Open website and click on shop
3) Set duration and click on any product category(eg: desk)
4) A traceback appears

Error:'UnboundLocalError: local variable 'all_tags' referenced before assignment'

On 'shop' method 'all_tags' was referenced before assignment form here

https://github.com/odoo/odoo/blob/5ba7e9e16c45ba618bb728f336102454d844d144/addons/website_sale/controllers/main.py#L480-L481

sentry-4680583793

closes odoo/odoo#144297

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/website_sale/controllers/main.py

@@ -398,14 +398,16 @@ class WebsiteSale(payment_portal.PaymentPortal):
                     max_price = max_price if max_price >= available_min_price else available_max_price
                     post['max_price'] = max_price
 
+        ProductTag = request.env['product.tag']
         if filter_by_tags_enabled and search_product:
-            ProductTag = request.env['product.tag']
             all_tags = ProductTag.search(
                 expression.AND([
                     [('product_ids.is_published', '=', True), ('visible_on_ecommerce', '=', True)],
                     website_domain
                 ])
             )
+        else:
+            all_tags = ProductTag
 
         categs_domain = [('parent_id', '=', False)] + website_domain
         if search: