add default value for description and examples in the API route for models (#1063)

src/routes/api/models/+server.ts

@@ -10,9 +10,9 @@ export async function GET() {
 		datasetName: model.datasetName,
 		datasetUrl: model.datasetUrl,
 		displayName: model.displayName,
-		description: model.description,
+		description: model.description ?? "",
 		logoUrl: model.logoUrl,
-		promptExamples: model.promptExamples,
+		promptExamples: model.promptExamples ?? [],
 		preprompt: model.preprompt,
 		multimodal: model.multimodal,
 		unlisted: model.unlisted,