Avoid crash if beacon committee subscription information is not present.

Fixes #1

CHANGELOG.md

@@ -1,4 +1,5 @@
 Development
+  - avoid crash if beacon committee subscription information is not present
   - add measurement of validator status fetching operations
   - increase maximum block receipt delay metric from 4s to 12s
   - add internal ability to list names of all active scheduler jobs

services/controller/standard/attester.go

@@ -132,6 +132,7 @@ func (s *Service) AttestAndScheduleAggregate(ctx context.Context, data interface
 		info, exists := slotInfoMap[attestation.Data.Index]
 		if !exists {
 			log.Debug().Uint64("attestation_slot", attestation.Data.Slot).Uint64("committee_index", attestation.Data.Index).Msg("No committee info; cannot aggregate")
+			continue
 		}
 		if info.Aggregate {
 			aggregatorDuty, err := attestationaggregator.NewDuty(ctx, info.ValidatorIndex, info.ValidatorPubKey, attestation, info.Signature)