Cypher: Make Q13's initial MATCH to be 'OPTIONAL'
8796093022357 AS person2Id
}
*/
-MATCH
+OPTIONAL MATCH // the 'OPTIONAL' modifier can be deleted if the parameter curation ensures that both person1 and person2 exist
(person1:Person {id: $person1Id}),
(person2:Person {id: $person2Id})
OPTIONAL MATCH
