fix layer count checks in backend to account for shared_empty_dataset

cartodb-org / cartodb

Location Intelligence & Data Visualization tool

http://cartodb.com

BSD 3-Clause "New" or "Revised" License

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Closed mbektash closed 6 years ago

acarrera42 commented 6 years ago

LGTM. @guido to comment on ::Map.can_add_layer() function logic looks fine. However it does not appear to be used. Is this correct?