Noun without article referes to a concept, a type. Kan du lide vindruer? (Do you like grapes?) is a question about grapes in general, not about the grapes in the bowl in front of you.
Jeg vil gerne have nogle vindruer, tak! (I would like some grapes, please!) refers to concrete objects of a certain size an quality.
Choose general form (no article) or unknown form (nogle) in the drop down list.