TrigCost: Skip empty events during CostAnalysis follow up
follow up to !44102 (merged)
skip also events that contain only HLT_noalg_CostMonDS_L1All
and HLT_noalg_L1All
chains
tagging @tamartin
follow up to !44102 (merged)
skip also events that contain only HLT_noalg_CostMonDS_L1All
and HLT_noalg_L1All
chains
tagging @tamartin