Collection and scope not found not parsing errors correctly

Instead of named exceptions scope/collection not found is not resulting in the right excpetion being thrown. e.g.:

Couchbase.CouchbaseException : {"errors":{"_":"Scope with name \"scope_none\" is not found"}} - Should be ScopeNotFound

Couchbase.CouchbaseException : {"errors":{"_":"Collection with name \"collection_null\" in scope \"scope_only\" is not found"}} - Should be CollectionNotFound