chore: sync validator error formatting

Author: remoterami

backend/pkg/api/services/service_slot_viz.go

@@ -228,8 +228,8 @@ func (s *Services) updateSlotVizData() error {
 				dutiesInfo.SlotSyncParticipated[duty.Slot] = make(map[constypes.ValidatorIndex]bool, 0)
 
 				partValidators := utils.GetParticipatingSyncCommitteeValidators(duty.SyncAggregateBits, dutiesInfo.TotalSyncAssignmentsForEpoch[utils.EpochOfSlot(duty.Slot)])
-				if len(partValidators) == 0 {
-					log.Error(nil, "no participating sync validators found", 0, map[string]interface{}{"slot": duty.Slot})
+				if partValidators == nil {
+					log.Error(nil, "couldn't align sync validators", 0, map[string]interface{}{"slot": duty.Slot})
 				}
 				for _, validator := range partValidators {
 					dutiesInfo.SlotSyncParticipated[duty.Slot][validator] = true