MinimumActivesStake reported as 0

[gpestana]

PR#12889 has introduced a helper for UI/UXs to query the minimum active stake by storing MinimumActiveStake in storage. This value is updated everytime the snapshot is created and the election data provider iterates over the T::VotersList (bags-list) to select the potential active nominators for the next era.

It has been reported that MinimumActiveStake in Polkadot and Kusama has zero in some eras. In the current implementation, there are a few reasons for the minimum active stake to be zero. However, this should no happen and the MinimumActiveStake should never be lower than MinNominatorBond.

• Ensure that MinimumActiveStake is never below MinNominatorBond
• Confirm the decoding issue in Kusama

More notes: https://hackmd.io/NCe-ZVJ2TOC6Tt78bU15BQ