Ignore nil x.ParsedKey being returned.

client_test/client_test.go

cmd/dgraph-bulk-loader/count_index.go

cmd/dgraph/main.go

cmd/dgraph/main_test.go

cmd/postingiterator/main.go

dgraph/embedded.go

posting/index.go

posting/list_test.go

posting/lists.go

query/query_test.go

schema/parse_test.go

schema/schema.go

worker/export.go

worker/groups.go

worker/sort.go

worker/task.go

worker/tokens.go

worker/worker_test.go

x/init.go

x/keys.go