fix(tx): when txReceipt.effectiveGasPrice is nill can't call txReceipt.effectiveGasPrice.toString()

[luchenqun]

Description and Related Issue(s)

when txReceipt.effectiveGasPrice is nill can't call txReceipt.effectiveGasPrice.toString() , see

frontend/ui/tx/TxDetailsDegraded.tsx

Lines 69 to 80 in fe81cfe

	const gasPrice = txReceipt?.effectiveGasPrice ?? tx.gasPrice;
	return {
	from: { ...unknownAddress, hash: tx.from as string },
	to: tx.to ? { ...unknownAddress, hash: tx.to as string } : null,
	hash: tx.hash as string,
	timestamp: block?.timestamp ? dayjs.unix(Number(block.timestamp)).format() : null,
	confirmation_duration: null,
	status,
	block: tx.blockNumber ? Number(tx.blockNumber) : null,
	value: tx.value.toString(),
	gas_price: txReceipt?.effectiveGasPrice.toString() ?? tx.gasPrice?.toString() ?? null,