Keep the title consistent with other string fields

query-node/mappings/src/workingGroups.ts

@@ -183,7 +183,7 @@ export async function createWorkingGroupOpeningMetadata(
     updatedAt: eventTime,
     originallyValid,
     applicationDetails: applicationDetails || undefined,
-    title: title ?? undefined,
+    title: title || undefined,
     description: description || undefined,
     shortDescription: shortDescription || undefined,
     hiringLimit: hiringLimit || undefined,