Implement fallback User.email resolver

backend/src/schema/resolvers/users.js

@@ -104,6 +104,14 @@ export default {
     },
   },
   User: {
+    email: async (parent, params, context, resolveInfo) => {
+      if (typeof parent.email !== 'undefined') return parent.email
+      const { id } = parent
+      const statement = `MATCH(u:User {id: {id}})-[:PRIMARY_EMAIL]->(e:EmailAddress) RETURN e`
+      const result = await instance.cypher(statement, { id })
+      let [{email}]= result.records.map(r => r.get('e').properties)
+      return email
+    },
     ...undefinedToNull([
       'actorId',
       'avatar',