Fixed undefined array key "values" in Mage_Catalog_Model_Product_Attribute_Backend_Media

[S0FTWEX]

There were still some warnings after product import without providing images additional data.

fixed undefined array key "values" in /app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php on line 113 and fixed foreach() argument must be of type array|object, null given in /app/code/core/Mage/Catalog/Model/Product/Attribute/Backend/Media.php on line 167.