refactor(objectDetailWidgets): replace non-null assertion with optional chaining

Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/eb0d0766-8b77-462f-ac89-6dfeb9b0e31c

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

apps/console/src/components/schema/objectDetailWidgets.tsx

@@ -161,7 +161,7 @@ export function ObjectRelationshipsWidget({ schema }: { schema: ObjectWidgetSche
         </h3>
         {hasRelationships ? (
           <div className="space-y-3">
-            {object.relationships!.map((rel, i) => (
+            {(object.relationships ?? []).map((rel, i) => (
               <div
                 key={i}
                 className="flex items-start gap-4 p-4 rounded-lg border bg-card hover:bg-accent/50 transition-colors"