DynamoDbMapper modifies empty string ("") to null while empty string has been officially supported by DynamoDb · Issue #2371 · aws/aws-sdk-java · GitHub
Solved Given a stream of strings, remove all empty strings. | Chegg.com
ios - Upload file using AWS S3 return empty string in Flutter - Stack Overflow
Allow empty Dynamodb Sets to be instantiated · Issue #3235 · aws/aws-sdk-js · GitHub