Missing 'aggregateRating''

Dear Sirs, Google warn us about missing field 'aggregateRating' in rich-cards with more than 1 review for a product (https://developers.google.com/search/docs/data-types/product). Thank you

I did the new release 1.20.
Plugin didn't add 'aggregateRating' if the product dosn't have any reviews (Rating).
Now plugin adds empty tag 'aggregateRating'.

Try and write me about result.

In addition to the previous issue check also the availability when the product is discontinued.

At the moment you send "availability":http://schema.org/OutOfStock, but you right value is "availability":http://schema.org/Discontinued

I did it.

This giving errors for products where there is no reviews, empty aggregateRating will give the below errors, please check

ratingCount - 0 (The value provided for ratingCount must be a positive value.)
cancelreviewCount - 0 (The value provided for reviewCount must be a positive value.)
Your review rating value was out of the provided range.

I investigation this issue

https://github.com/schemaorg/schemaorg/issues/1770
https://developers.google.com/search/docs/data-types/review-snippet

Google wants to see reviews about your product.
I decided to remove tag 'aggregateRating' for products without any reviews.

1. If your product doesn't have any reviews Google writes "Warning - Missing 'aggregateRating'".
2. If I add tag 'aggregateRating' for products without any reviews Google writes "Error".

I think 'Warning' is better than 'Error'.

I did new release 1.21

Thanks a lot for this change.