[Bug]: panic when totalPreviousPower is zero

[jasonsong0]

Summary of Bug

It is unclear when totalPreviousPower becomes 0, but if it does, a panic could occur.

cosmos-sdk/x/distribution/keeper/allocation.go

Line 36 in 748c1ed

powerMultiplier := math.LegacyNewDec(nativeTotalPower).QuoTruncate(math.LegacyNewDec(totalPreviousPower))

Since there is a routine that handles cases where it is 0, it would be better to either let the handling occur after the code or move the zero check to an earlier point in the code.

cosmos-sdk/x/distribution/keeper/allocation.go

Line 64 in 748c1ed

if totalPreviousPower == 0 {

Version

v0.50.8/multi-asset-staking-poc

Steps to Reproduce