Handle nulls that occur in embedded ids
Handle nulls that occur in embedded ids

fabric:docid calls erlang:error if an id is null so it seems like
we should not bother to even spawn a process to call open in this
case as it's a common value from JS errors.

BugzID:13586

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb