op-batcher: invalid memory address or nil pointer dereference

[claymega]

Bug Description

This Error occurs when calling RecordBlobBaseFee() while running the op-batcher.

The normal call is as follows:

	if tip.ExcessBlobGas != nil {
		blobFee := eip4844.CalcBlobFee(*tip.ExcessBlobGas)
		m.metr.RecordBlobBaseFee(blobFee)
	}

but panic call as follows :

        # xx/optimism/op-service/txmgr/txmgr.go:896

	m.metr.RecordTipCap(tip)
	m.metr.RecordBaseFee(baseFee)
	m.metr.RecordBlobBaseFee(blobFee)

func (t *TxMetrics) RecordBlobBaseFee(blobBaseFee *big.Int) {
	bff, _ := blobBaseFee.Float64()
	t.blobBaseFee.Set(bff)
}

Steps to Reproduce
Run an op-reth as the l2 execution client, and then run op-batcher

Expected behavior

Environment Information:

• op-batcher v1.9.4