Fix article category fallback for pricelist gaps

internal/article/categories.go

@@ -71,13 +71,31 @@ func ResolveLotCategoriesStrict(local *localdb.LocalDB, serverPricelistID uint,
 	if err != nil {
 		return nil, err
 	}
+	missing := make([]string, 0)
 	for _, lot := range lotNames {
 		cat := strings.TrimSpace(cats[lot])
 		if cat == "" {
-			return nil, &MissingCategoryForLotError{LotName: lot}
+			missing = append(missing, lot)
+			continue
 		}
 		cats[lot] = cat
 	}
+	if len(missing) > 0 {
+		fallback, err := local.GetLocalComponentCategoriesByLotNames(missing)
+		if err != nil {
+			return nil, err
+		}
+		for _, lot := range missing {
+			if cat := strings.TrimSpace(fallback[lot]); cat != "" {
+				cats[lot] = cat
+			}
+		}
+		for _, lot := range missing {
+			if strings.TrimSpace(cats[lot]) == "" {
+				return nil, &MissingCategoryForLotError{LotName: lot}
+			}
+		}
+	}
 	return cats, nil
 }