[FIX] website_sale: _rec_name product.attribute.line

Set the _rec_name for product.attribute.line model, as its column name wasn't defined, and therefore search on it wasn't possible (For instance, do an advanced search on product.product with "Product Attributes" "Contains" "Something" wasn't possible).

addons/website_sale/models/product_characteristics.py

@@ -66,6 +66,7 @@ class attributes_value(osv.Model):
 class attributes_product(osv.Model):
     _name = "product.attribute.line"
     _order = 'attribute_id, value_id, value'
+    _rec_name = 'attribute_id'
     _columns = {
         'value': fields.float('Numeric Value'),
         'value_id': fields.many2one('product.attribute.value', 'Textual Value'),