[PUBLISH][ENQUEUE] when getting enqueue service, replace unknown value by "correct"
[PUBLISH][ENQUEUE] when getting enqueue service, replace unknown value by "correct"

This is a hotfix to a crash caused by "update" value, seen on Fidelity
instance.

SDESK-3555

superdesk/superdesk-core,mdhaman/superdesk-core,ioanpocol/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,ioanpocol/superdesk-core,superdesk/superdesk-core,mdhaman/superdesk-core,ioanpocol/superdesk-core,mdhaman/superdesk-core,petrjasek/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core