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UpdateItem's "ADD" operation usually adds elements to an existing set or adds a number to an existing counter. But it can *also* be used to create a new set or counter (as if adding to an empty set or zero). We unfortunately did not have a test for this case (creating a new set or counter), and when I wrote such a test now, I discovered the implementation was missing. So this patch adds both the test and the implementation. The new test used to fail before this patch, and passes with it - and passes on DynamoDB. Note that we only had this bug for the newer UpdateItem syntax. For the old AttributeUpdates syntax, we already support ADD actions on missing attributes, and already tested it in test_update_item_add(). I just forgot to test the same thing for the newer syntax, so I missed this bug :-( Fixes #7763. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20201207085135.2551845-1-nyh@scylladb.com>