fix: address code review — null check for getObject, boot error logging

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

Author: Copilot

apps/studio/api/_kernel.ts

@@ -73,6 +73,7 @@ async function bootKernel(): Promise<ObjectKernel> {
         } catch (err) {
             // Clear the lock so the next request can retry
             _bootPromise = null;
+            console.error('[Vercel] Kernel boot failed:', (err as any)?.message || err);
             throw err;
         }
     })();

packages/runtime/src/http-dispatcher.ts

@@ -400,7 +400,7 @@ export class HttpDispatcher {
                     const qlService = await this.getObjectQLService();
                     if (qlService?.registry) {
                         const data = qlService.registry.getObject(name);
-                        return { handled: true, response: this.success(data) };
+                        if (data) return { handled: true, response: this.success(data) };
                     }
                     return { handled: true, response: this.error('Not found', 404) };
                 }