internal/ethapi: fix nil deref + fix estimateGas console bindings (#21601)

* tried to fix

* fix for js api

* fix for nil pointer ex

* rev space

* rev space

* input call formatter

internal/ethapi/api.go

@@ -963,6 +963,9 @@ func DoEstimateGas(ctx context.Context, b Backend, args CallArgs, blockNrOrHash
 		if err != nil {
 			return 0, err
 		}
+		if block == nil {
+			return 0, errors.New("block not found")
+		}
 		hi = block.GasLimit()
 	}
 	// Recap the highest gas limit with account's available balance.