hiding data layer tooltip when there is no data layer description
hiding data layer tooltip when there is no data layer description

Ecotrust/PEW-EFH,Ecotrust/PEW-EFH,Ecotrust/PEW-EFH,Ecotrust/PEW-EFH,Ecotrust/PEW-EFH,Ecotrust/PEW-EFH