Fix item type when loading data in RRD backend.
Fix item type when loading data in RRD backend.

githubert/facette,hirocaster/facette,psytra/facette,yonglehou/facette,Skrupellos/facette,yonglehou/facette,iaean/facette,yonglehou/facette,vovkasm/facette,vovkasm/facette,Skrupellos/facette,facette/facette,psytra/facette,iaean/facette,facette/facette,psytra/facette,githubert/facette,vovkasm/facette,hirocaster/facette,hirocaster/facette,githubert/facette,facette/facette,facette/facette,Skrupellos/facette,iaean/facette