core: fix panic when stat-ing a tx from a queue-only account (#15714)

core/tx_pool.go

@@ -838,7 +838,7 @@ func (pool *TxPool) Status(hashes []common.Hash) []TxStatus {
 	for i, hash := range hashes {
 		if tx := pool.all[hash]; tx != nil {
 			from, _ := types.Sender(pool.signer, tx) // already validated
-			if pool.pending[from].txs.items[tx.Nonce()] != nil {
+			if pool.pending[from] != nil && pool.pending[from].txs.items[tx.Nonce()] != nil {
 				status[i] = TxStatusPending
 			} else {
 				status[i] = TxStatusQueued