Check if references property exists in description before referencing it
Check if references property exists in description before referencing it

Previously we would check if the reference slot exists in 'references'
before even checking if 'references' exists at all. With this
commit, references really are optional.

https://phabricator.endlessm.com/T12825

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib