Nested updates that are noops should imply an add.
Nested updates that are noops should imply an add.

See https://github.com/basho/riak-erlang-client/issues/159#issuecomment-35528798

esl/riak-erlang-client,SiftLogic/riak-erlang-client,linearregression/riak-erlang-client,inaka/riak-erlang-client,GabrielNicolasAvellaneda/riak-erlang-client,rhumbertgz/riak-erlang-client,jmayfield74/riak-erlang-client,pma/riak-erlang-client,paulperegud/riak-erlang-client,groovenauts-erlang/riak-erlang-client