Catch a scenario in which the SKU table entries have been created, but the handler class hasn't been deployed yet
Summary: Our new namespace deployed master, therefor creating skus entries, but without the handler classes being available on actual production.
Test Plan: None
Reviewers: #hkccp_developers, machniak
Reviewed By: #hkccp_developers, machniak
Differential Revision: https://git.kolab.org/D1834