fix blob validation for empty blobs when using

beacon_node/beacon_chain/src/attester_cache.rs

@@ -42,6 +42,7 @@ pub enum Error {
     // Boxed to avoid an infinite-size recursion issue.
     BeaconChain(Box<BeaconChainError>),
     MissingBeaconState(Hash256),
+    MissingBlobs,
     FailedToTransitionState(StateAdvanceError),
     CannotAttestToFutureState {
         state_slot: Slot,

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2935,7 +2935,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         // If the write fails, revert fork choice to the version from disk, else we can
         // end up with blocks in fork choice that are missing from disk.
         // See https://github.com/sigp/lighthouse/issues/2028
-        let (signed_block, blobs) = signed_block.deconstruct();
+        let (signed_block, blobs) = signed_block.deconstruct(Some(block_root));
         let block = signed_block.message();
         let mut ops: Vec<_> = confirmed_state_roots
             .into_iter()

beacon_node/beacon_chain/src/early_attester_cache.rs

@@ -69,7 +69,7 @@ impl<E: EthSpec> EarlyAttesterCache<E> {
             },
         };
 
-        let (block, blobs) = block.deconstruct();
+        let (block, blobs) = block.deconstruct(Some(beacon_block_root));
         let item = CacheItem {
             epoch,
             committee_lengths,
@@ -77,7 +77,7 @@ impl<E: EthSpec> EarlyAttesterCache<E> {
             source,
             target,
             block,
-            blobs: blobs?,
+            blobs: blobs.map_err(|_|Error::MissingBlobs)?,
             proto_block,
         };