couchbase/couchbase-lite-java-core — pull request #177 by andreibaranouski (2014-04-25 14:24:48+00:00)
Title: Document.getProperty should return null if a key doesn't exist

on ios https://github.com/couchbase/couchbase-lite-ios/blob/master/Source/API/CBLDocument.m#L226
it return nil if a key doesn't exist.