fix: can't sort on undefined sdks (#8982)

## About the changes
According to some logs, sdks can be undefined:
```
TypeError: Cannot read properties of null (reading 'sort')\n    at /unleash/node_modules/unleash-server/dist/lib/db/client-applications-store.js:330:22\n 
```

src/lib/db/client-applications-store.ts

@@ -412,7 +412,7 @@ export default class ClientApplicationsStore
             return acc;
         }, []);
         environments.forEach((env) => {
-            env.sdks.sort();
+            env.sdks?.sort();
         });
 
         return {