Does anyone else understand the behaviour below? :
This can be tested in the standard odoo runbot in v8.0

In the existing product list, observe the number of products. Say there are 100
Create a new product, lets name it "test". In the variant tab, we add the variant "Color" without inputting any Product Attribute Value.

When we save this, it seems the product has disappeared and the product total is not 100 anymore but 99!
I understand that not adding a attibute value may confuse the system but where does the disappeared product go?