In my Googse Search Console I have warning that some of the keys-values of Schema.org (using JSON-LD) on my website are missing. However, they're missing on purpose -- there's no data to be added to them.
For instance, https://schema.org/AggregateRating - For some products on my website there's no rating yet, no one has rated such products yet. Hence, I don't add
AggregateRating key on the product page.
In such cases, what should I do? Should I continue having them omitted? Or should I add them with null or empty values?