params: 
data must not be empty
/home/storagev2/xstorage.rb:19:in `update'
/home/storagev2/xstorage.rb:19:in `decrypt'
/home/storagev2/xstorage.rb:223:in `decode'
/home/storagev2/xstorage.rb:230:in `dispatch'
/home/storagev2/xstorage.rb:254:in `main'
/home/storagev2/xsettings.rb:16:in `<main>'