feat: article is not required now

src/client/models/ProductSchema.ts

@@ -5,7 +5,7 @@
 import type { BarcodeTemplateSchema } from './BarcodeTemplateSchema';
 export type ProductSchema = {
     name: string;
-    article: string;
+    article?: (string | null);
     clientId: number;
     barcodes: Array<string>;
     barcodeTemplate?: (BarcodeTemplateSchema | null);