Do not run NCalcEMA if already at same value (#737)

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## Purpose of Changes and their Description
Efficiency: do not run NCalcEMA if already at same value

## Are these changes tested and documented?

- [x] If tested, please describe how. If not, why tests are not needed.
-- unit tests
- [x] If documented, please describe where. If not, describe why docs
are not needed. -- no need, just optim
- [x] Added to `Unreleased` section of `CHANGELOG.md`?

Author: xmariachi

CHANGELOG.md

@@ -80,6 +80,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * [#764](https://github.com/allora-network/allora-chain/pull/764) TopicRewardAlpha using weekly cadence
 * [#769](https://github.com/allora-network/allora-chain/pull/769) Stored NetworkInferences instead of query-time. Removal of `GetLatestAvailableNetworkInferences`
 * [#794](https://github.com/allora-network/allora-chain/pull/794) Optimize topic weights fetch and update flow
+* [#737](https://github.com/allora-network/allora-chain/pull/737) Do not run NCalcEMA if already at same value
 
 ### Deprecated
 

x/emissions/keeper/actor_penalties.go

@@ -90,6 +90,10 @@ func ApplyLivenessPenaltyToActor(
 		return types.Score{}, err
 	}
 
+	if emaScore.Score.Equal(penalty) {
+		return emaScore, nil
+	}
+
 	beforePenalty := emaScore
 	emaScore.Score, err = applyPenalty(topic, penalty, emaScore.Score, missedEpochs)
 	if err != nil {