Matthew Surabian 1886e45e36 DynamoDB Nested Values Bug (#4570)
* Add tests to ExerciseBackend to expose nested-values bug

* Update DynamoDB physical backend Delete and hasChildren logic to prevent overzealous cleanup of folders and values
2018-05-16 13:30:56 -04:00
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2018-05-16 13:30:56 -04:00