Fix gas-provider error caused by empty blocks

[LEAFERx]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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On a chain that supports EIP-1559, when there's an empty block, the reward returned from eth_feeHistory will be 0. However, AutomaticGasPriceProvider should set maxPriorityFeePerGas to be at least 1 to avoid ProviderError: FeeTooLow, EffectivePriorityFeePerGas too low 0 < 1.

This bug is found on Chiado, a minimal reproducible example and detailed analysis can be found here.

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[alcuadrado]

Hey, sorry we never merged this, and thanks for sending this PR. I'm closing it as I believe it has already been fixed.