MAGETWO-64047: WebAPI: It's impossible to empty numeric fields after they're set

Author: Cari Spruiell

app/code/Magento/Catalog/Model/Product/Attribute/Backend/Price.php

@@ -128,6 +128,7 @@ public function afterSave($object)
         $attribute = $this->getAttribute();
         $attributeCode = $attribute->getAttributeCode();
         $value = $object->getData($attributeCode);
+        // $value may be passed as null to unset the attribute
         if ($value === null || (float)$value > 0) {
             if ($attribute->isScopeWebsite() && $object->getStoreId() != \Magento\Store\Model\Store::DEFAULT_STORE_ID) {
                 if ($this->isUseDefault($object)) {