Completing edit 159986, which cleared a link to the "Richard Coeur de Lion (disambiguation)" page but reported that no real article could be verified. One can: https://en.wikipedia.org/wiki/Richard_Coeur-de-lion_(opera) carries Category:Operas by Andre Gretry and opens "Richard Coeur-de-lion ... is an opera comique ... by the Belgian composer Andre Gretry". The spelling with the oe ligature (Coeur) is a redlink, which may be why it was missed. Found during an audit of edits 159875-159992.

Clearing a wikipediaUrl that pointed at "Richard Coeur de Lion (disambiguation)", a disambiguation page rather than this opera's article. A disambiguation link is worse than an empty field because it looks like data. Searching for the real article and requiring both Category:Operas by this composer and a title match found no verified candidate; leaving it empty rather than guessing.

Wikipedia article: https://en.wikipedia.org/wiki/Richard_Coeur_de_Lion_(disambiguation)