Fix error message when connection to database fails.
Fix error message when connection to database fails.

Fiware/data.Orion,telefonicaid/fiware-orion,Fiware/data.Orion,Fiware/data.Orion,Fiware/data.Orion,Fiware/data.Orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,Fiware/data.Orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion