show urn when api call fails
show urn when api call fails

When the API call to the cite mapper to find the name of a work fails
(because it's not in Perseus or for any other reason), then show the URN
in the title field.

Previously, if the API call failed, the field would be blank.

latin-language-toolkit/arethusa,alpheios-project/arethusa,alpheios-project/arethusa,alpheios-project/arethusa,latin-language-toolkit/arethusa