crowdmob/goamz — pull request #65 by nabeken (2014-01-06 11:21:45+00:00)
Title: dynamodb: Do not omit empty value in some types

This PR fixes a marshaling issue with empty values.

See http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_PutItem.html
for what empty values we should omit.