added empty upgrade handler

app/upgrades/empty_upgrade_handler.go

@@ -0,0 +1,15 @@
+package upgrades
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/types/module"
+	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
+)
+
+// EmptyUpgradeHandler - should be used to create upgrade handler for gov software upgrades that require no migration
+func EmptyUpgradeHandler() upgradetypes.UpgradeHandler {
+	return func(ctx sdk.Context, _plan upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
+		//do nothing on purpose
+		return vm, nil
+	}
+}

app/upgrades/v512/upgrades.go

@@ -1,16 +1,12 @@
 package v512
 
 import (
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	"github.com/cosmos/cosmos-sdk/types/module"
+	"github.com/bze-alphateam/bze/app/upgrades"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
 )
 
 const UpgradeName = "v5.1.2"
 
 func CreateUpgradeHandler() upgradetypes.UpgradeHandler {
-	return func(ctx sdk.Context, _plan upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
-		//do nothing on purpose
-		return vm, nil
-	}
+	return upgrades.EmptyUpgradeHandler()
 }

app/upgrades/v610/upgrades.go

@@ -1,16 +1,12 @@
 package v610
 
 import (
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	"github.com/cosmos/cosmos-sdk/types/module"
+	"github.com/bze-alphateam/bze/app/upgrades"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
 )
 
 const UpgradeName = "v6.1.0"
 
 func CreateUpgradeHandler() upgradetypes.UpgradeHandler {
-	return func(ctx sdk.Context, _plan upgradetypes.Plan, vm module.VersionMap) (module.VersionMap, error) {
-		// nothing to do
-		return vm, nil
-	}
+	return upgrades.EmptyUpgradeHandler()
 }