fix ingestion of existing associations (#2084)
fix ingestion of existing associations (#2084)

it's using ref from ingest without guid
petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core,petrjasek/superdesk-core,superdesk/superdesk-core