rpdata-as2storyimport: Fixed category vailidty check failing when it is valid, not when it isn't.

cmd/rpdata-as2storyimport/main.go

@@ -81,7 +81,7 @@ func main() {
 		}
 
 		category := models.StoryCategory(result.Category)
-		if category.IsValid() {
+		if !category.IsValid() {
 			log.Println(result.Name, "does not have a valid category:", result.Category)
 			continue
 		}