[FIX] product: variant name_get for specific providers

This is related to revision
b65c67a259

The field `seller_ids` is a field which is set
on the `product.template`, and this is why
the condition `(x.product_id == product)` is being applied
in the list comprehension searching the current seller
of the product sellers.

The `variant` variable is a string containing
the attribute name of a variant.
Therefore, if a product tempalte has only one variant, without
any attribute (e.g. when you don't use variants),
`variant` will be empty, and therefore the condition
`if variant:` will be `False`, and therefore it won't search
in the product sellers with a specific `product.product`, while it
should, as, even if there are no attributes, there could be a
seller line with this specific `product.product`.

Besides, as we are in the `name_get` of `product.product`, and
not the `name_get` of `product.template`, we are always in the case
of a `variant`, this test is therefore pointless.

opw-682390

addons/product/product.py

@@ -1077,8 +1077,7 @@ class product_product(osv.osv):
             name = variant and "%s (%s)" % (product.name, variant) or product.name
             sellers = []
             if partner_ids:
-                if variant:
-                    sellers = [x for x in product.seller_ids if (x.name.id in partner_ids) and (x.product_id == product)]
+                sellers = [x for x in product.seller_ids if (x.name.id in partner_ids) and (x.product_id == product)]
                 if not sellers:
                     sellers = [x for x in product.seller_ids if (x.name.id in partner_ids) and not x.product_id]
             if sellers: