[refactor] changes to block rewards

Son of Odinrequested to merge
check-block-rewards into master

Related to heimdall!16 (merged)

While validating the block rewards code base i found a couple bugs patched here. I also made a change where if there are no swaps in a block (ie no liquidity fees), then we do not give out block rewards to anybody. This just made it a lot easier to simulate the economics in a cleaner way, we may revisit this design choice later and reverse it.

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