Fix circuits integration tests panic: "unwrap on None value" when EIP-4896 withdrawals==None

[AronisAt79]

Description

Integration Tests have been failing since introduction of #1369, due to Option::Unwrap on None value, when eth_block.withdrawals==None.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Contents

• zkevm-circuits/zkevm-circuits/src/witness/block.rs

Rationale

replace eth_block.withdrawals.clone().unwrap() with eth_block.withdrawals.clone().unwrap_or_default()

How Has This Been Tested?

https://github.com/privacy-scaling-explorations/zkevm-circuits/actions/runs/6968928576/job/18963801769

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Issue

#1687

[ChihChengLiang]

LGTM. I see the unwrap panic in the CI run referenced in the issue is fixed in the run referenced in your pull request description

[AronisAt79]

Thanks @ChihChengLiang . Yes the unwrap_or_default clears the error so if this solution is acceptable, we can merge this fix. I would like though to have another review from @KimiWu123 cause integration tests still fail down the process. evm and super circuit tests fail for erc20_openzeppelin_transfers with panic

circuit fixed columns are not constant for different witnesses

just to make sure this failure is not somehow logically associated to the fix provided with this PR. If so, we can take care of the new panic with a new issue :)

[KimiWu123]

LGTM! Thanks for your fix!