chore: do sanity check first

[zhiqiangxu]

The original implementation won't cause nil pointer error, but I think it's always a good convention to do sanity check first, before accessing .

[coderabbitai]

Walkthrough

Walkthrough

The update involves refining the transaction processing logic within a specific function. By adjusting the sequence of operations, it now preemptively checks for the presence of transactions in a block, ensuring that an empty block is caught and handled early. This enhancement prevents unnecessary processing efforts on blocks devoid of transactions, streamlining the overall flow and improving error handling.

Changes

File	Summary
op-node/rollup/derive/channel_out.go	Moved the check for transaction length in BlockToSingularBatch above transaction processing loop to handle empty blocks early.

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[tynes]

Not sure how useful this is to be honest, very minimal difference

[zhiqiangxu]

Yeah it's just a nit, but I came across this code twice, so I decided to give it a try lol!

[ajsutton]

Will merge this, but these kinds of trivial changes that don't actually affect functionality are taking us more time to review than the value they're really giving. Would be great to focus on PRs that are changing the actual observed behaviour for users in future.