fix dashboard filter bug, fix delete slug query, change to PUT, fix assignment of empty value on slug change
fix dashboard filter bug, fix delete slug query, change to PUT, fix assignment of empty value on slug change

Network-of-BioThings/smartAPI,Network-of-BioThings/smartAPI,Network-of-BioThings/smartAPI,Network-of-BioThings/smartAPI,Network-of-BioThings/smartAPI