Ignore sync committee messages and contributions if head slot is not available

Author: Tumas

operation_pools/src/sync_committee_agg_pool/tasks.rs

@@ -198,7 +198,13 @@ impl<P: Preset, W: Wait> HandleExternalContributionTask<P, W> {
             return Ok(ValidationOutcome::Ignore(false));
         }
 
-        let beacon_state = controller.preprocessed_state_at_current_slot()?;
+        let beacon_state = match controller.preprocessed_state_at_current_slot() {
+            Ok(beacon_state) => beacon_state,
+            Err(error) => {
+                debug!("cannot validate sync committee contribution: {error:?}");
+                return Ok(ValidationOutcome::Ignore(false));
+            }
+        };
 
         let is_valid = validate_external_contribution_and_proof(
             controller.chain_config(),
@@ -302,7 +308,13 @@ impl<P: Preset, W: Wait> HandleExternalMessageTask<P, W> {
             return Ok(ValidationOutcome::Ignore(false));
         }
 
-        let beacon_state = controller.preprocessed_state_at_current_slot()?;
+        let beacon_state = match controller.preprocessed_state_at_current_slot() {
+            Ok(beacon_state) => beacon_state,
+            Err(error) => {
+                debug!("cannot validate sync committee message: {error:?}");
+                return Ok(ValidationOutcome::Ignore(false));
+            }
+        };
 
         let is_valid = validate_external_message(
             controller.chain_config(),