Really now?
AWS, #1 cloud provider with their #1 cloud database DynamoDB, all shiny, highly dynamic NoSQL, your data schema could change any second...

then DynamoDB errors out when one of your values is an empty string? {"foo":""} is impossible to store?

Like nobody ever saw or used empty strings a a value or what? There are tons of upvotes to fix this.

I just have to imagine the Product owner standing there: "No,no,no. They are just using it wrong if their data has empty strings as value. Won't fix!"