tweak debug output

x/distribution/types/fee_pool.go

@@ -39,15 +39,18 @@ func (ta TotalAccum) UpdateForNewHeight_DEBUG(height int64, accumCreatedPerBlock
 	if blocks < 0 {
 		panic("reverse updated for new height")
 	}
+	if !accumCreatedPerBlock.IsZero() && blocks != 0 {
 		fmt.Println(
 			cmn.Blue(
-			fmt.Sprintf("FP Add %v * %v = %v +=> %v",
+				fmt.Sprintf("FP Add %v * %v = %v, + %v (old) => %v (new)",
 					accumCreatedPerBlock, sdk.NewInt(blocks),
 					accumCreatedPerBlock.MulInt(sdk.NewInt(blocks)),
+					ta.Accum,
 					ta.Accum.Add(accumCreatedPerBlock.MulInt(sdk.NewInt(blocks))),
 				),
 			),
 		)
+	}
 	ta.Accum = ta.Accum.Add(accumCreatedPerBlock.MulInt(sdk.NewInt(blocks)))
 	ta.UpdateHeight = height
 	return ta

x/distribution/types/validator_info.go

@@ -65,15 +65,18 @@ func (vi ValidatorDistInfo) TakeFeePoolRewards(fp FeePool, height int64, totalBo
 	commission := withdrawalTokens.MulDec(commissionRate)
 	afterCommission := withdrawalTokens.Minus(commission)
 
+	if !accum.IsZero() {
 		fmt.Println(
 			cmn.Red(
-			fmt.Sprintf("FP Sub %v * %v = %v -=> %v",
+				fmt.Sprintf("FP Sub %v * %v = %v, %v - _ => %v",
 					vdTokens, sdk.NewInt(blocks),
 					accum,
+					fp.TotalValAccum.Accum,
 					fp.TotalValAccum.Accum.Sub(accum),
 				),
 			),
 		)
+	}
 
 	fp.TotalValAccum.Accum = fp.TotalValAccum.Accum.Sub(accum)
 	fp.Pool = remainingTokens