Ignore entries whose UUID is null
Ignore entries whose UUID is null

Apparently, we sometimes get entries with UUID = null.
We should investigate further to see why this happens.
https://github.com/e-mission/e-mission-server/issues/292

For now, we ignore them since the processed data won't be used for anything
anyway

shankari/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,yw374cornell/e-mission-server,e-mission/e-mission-server,e-mission/e-mission-server,shankari/e-mission-server,yw374cornell/e-mission-server,yw374cornell/e-mission-server,shankari/e-mission-server,shankari/e-mission-server,sunil07t/e-mission-server,sunil07t/e-mission-server,yw374cornell/e-mission-server