fix: avoid producing empty block when pending transactions is high #195
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This commit adapts BSC PR: bnb-chain/bsc#112 to Ronin.
An empty block is pre-sealed by default. It's expected that a new block with
transactions is committed and abort the empty block producer if there are
pending transactions. However, with the low block time, in case there are a lot
of pending transactions, the commit transactions time exceeds the time an empty
block is produced. As a result, block with transactions is not produced but an
empty block and no real transactions is mined.