Fixes

• When there are no component items defined on an assembly item, the Live Inventory service was returning an "item not found" error instead of the assembly item information. It will now return the inventory of assembly items in this case.
  
• Made localizationCountry and localizationLanguage optional in Product Data's getProductSellable() API call.
  
• Added missing maxImprintColors in Product Data 2.0.0's XML Schema Definition (XSD).