Check if object attribute is of Option class and create stub
Check if object attribute is of Option class and create stub

If we're dealing with Option class we need to store stubs in
revisions table instead of only some_attr_id to enable
frontend rendering for snapshots.

AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,plamut/ggrc-core,AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,plamut/ggrc-core