BUG - prevBlock null

[cdrcools]

"Base\Deployments\ThresholdConditionCache.cs" line 89

indexPrev is null when height is 0
Not an issue unless your starting fresh.

[dangershony]

ah I see are you able to propose a fix and open a PR?

[cdrcools]

Came up with a quick workaround on the calling method
Old
List metrics = ruleEngine.NodeDeployments.BIP9.GetThresholdStateMetrics(this.ChainState.ConsensusTip.Previous, thresholdStates);

New
List metrics = ruleEngine.NodeDeployments.BIP9.GetThresholdStateMetrics(this.ChainState.ConsensusTip.Previous ?? this.ChainState.ConsensusTip, thresholdStates);

Works for me

[dangershony]

ok looks fine please make a PR