FIX: len did not respect hidden keys
FIX: len did not respect hidden keys

tacaswell/metadataStore,arkilic/metadatastore,ericdill/databroker,hhslepicka/metadatastore,NSLS-II/metadatastore,hhslepicka/metadatastore,tacaswell/metadataStore,NSLS-II/metadatastore,arkilic/metadatastore,ericdill/databroker