- taxable tx simulation improvements

custom/auth/ante/fee.go

@@ -6,6 +6,7 @@ import (
 
 	errorsmod "cosmossdk.io/errors"
 
+	"github.com/classic-terra/core/v3/types/assets"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	"github.com/cosmos/cosmos-sdk/x/auth/ante"
@@ -111,6 +112,16 @@ func (fd FeeDecorator) checkDeductFee(ctx sdk.Context, feeTx sdk.FeeTx, taxes sd
 			}
 		}
 
+		// it might also be that there is no taxes at all, then we need to add one
+		if len(taxes) == 0 {
+			denom := assets.MicroLunaDenom
+			if !fee.IsZero() {
+				denom = fee[0].Denom
+			}
+
+			taxes = sdk.NewCoins(sdk.NewCoin(denom, sdk.NewInt(10)))
+		}
+
 		if fee.IsZero() {
 			feesOrTax = taxes
 		}