FHE empty slice fix (#14857)

* FHE empty slice fix

* Add changeset

.changeset/fifty-squids-juggle.md

@@ -0,0 +1,5 @@
+---
+"chainlink": minor
+---
+
+FHE empty reward fix #internal

core/chains/evm/gas/fee_history_estimator.go

@@ -256,9 +256,10 @@ func (f *FeeHistoryEstimator) RefreshDynamicPrice() error {
 		priorityFee := big.NewInt(0)
 		priorityFeeThreshold := big.NewInt(0)
 		for _, reward := range feeHistory.Reward {
-			// reward needs to have values for two percentiles
+			// reward needs to have values for two percentiles. Some chains may return an empty slice instead of 0x0 values, so we use
+			// continue instead of throwing an error.
 			if len(reward) < 2 {
-				return fmt.Errorf("reward size incorrect: %d", len(reward))
+				continue
 			}
 			// We'll calculate the average of non-zero priority fees
 			if reward[0].Cmp(big.NewInt(0)) > 0 {

core/chains/evm/gas/fee_history_estimator_test.go

@@ -226,7 +226,7 @@ func TestFeeHistoryEstimatorGetDynamicFee(t *testing.T) {
 
 		feeHistoryResult := &ethereum.FeeHistory{
 			OldestBlock:  big.NewInt(1),
-			Reward:       [][]*big.Int{{maxPriorityFeePerGas1, big.NewInt(5)}, {maxPriorityFeePerGas2, big.NewInt(5)}}, // first one represents market price and second one connectivity price
+			Reward:       [][]*big.Int{{maxPriorityFeePerGas1, big.NewInt(5)}, {maxPriorityFeePerGas2, big.NewInt(5)}, {}}, // first one represents market price and second one connectivity price
 			BaseFee:      []*big.Int{baseFee, baseFee},
 			GasUsedRatio: nil,
 		}