cmd/evm: add back stateroot to jsonl-output (ethereum#27968)

The PR ethereum#26274 broke the evm statetest command a bit, in that it stopped spitting out the stateroot following a non-successful statetest-execution. 

This PR changes it back, so the stateroot is unconditionally output on stderr, and makes it so fuzzing works again.

cmd/evm/staterunner.go

@@ -107,19 +107,20 @@ func runStateTest(fname string, cfg vm.Config, jsonOut, dump bool) error {
 			// Run the test and aggregate the result
 			result := &StatetestResult{Name: key, Fork: st.Fork, Pass: true}
 			test.Run(st, cfg, false, rawdb.HashScheme, func(err error, snaps *snapshot.Tree, state *state.StateDB) {
+				if state != nil {
+					root := state.IntermediateRoot(false)
+					result.Root = &root
+					if jsonOut {
+						fmt.Fprintf(os.Stderr, "{\"stateRoot\": \"%#x\"}\n", root)
+					}
+				}
 				if err != nil {
 					// Test failed, mark as so and dump any state to aid debugging
 					result.Pass, result.Error = false, err.Error()
 					if dump {
 						dump := state.RawDump(nil)
 						result.State = &dump
 					}
-				} else {
-					root := state.IntermediateRoot(false)
-					result.Root = &root
-					if jsonOut {
-						fmt.Fprintf(os.Stderr, "{\"stateRoot\": \"%#x\"}\n", root)
-					}
 				}
 			})
 			results = append(results, *result)