fix(x/consensus)!: update cons params parsing checks (backport #21484) (#21493)

Co-authored-by: MSalopek <matija.salopek994@gmail.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

CHANGELOG.md

@@ -48,6 +48,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (x/consensus) [#21493](https://github.com/cosmos/cosmos-sdk/pull/21493) Fix regression that prevented to upgrade to > v0.50.7 without consensus version params.
 * (baseapp) [#21256](https://github.com/cosmos/cosmos-sdk/pull/21256) Halt height will not commit the block indicated, meaning that if halt-height is set to 10, only blocks until 9 (included) will be committed. This is to go back to the original behavior before a change was introduced in v0.50.0.
 * (baseapp) [#21444](https://github.com/cosmos/cosmos-sdk/pull/21444) Follow-up, Return PreBlocker events in FinalizeBlockResponse.
 

Makefile

@@ -467,10 +467,10 @@ localnet-build-dlv:
 localnet-build-nodes:
 	$(DOCKER) run --rm -v $(CURDIR)/.testnets:/data cosmossdk/simd \
 			  testnet init-files --v 4 -o /data --starting-ip-address 192.168.10.2 --keyring-backend=test
-	docker-compose up -d
+	docker compose up -d
 
 localnet-stop:
-	docker-compose down
+	docker compose down
 
 # localnet-start will run a 4-node testnet locally. The nodes are
 # based off the docker images in: ./contrib/images/simd-env

x/consensus/keeper/keeper.go

@@ -78,6 +78,12 @@ func (k Keeper) UpdateParams(ctx context.Context, msg *types.MsgUpdateParams) (*
 	if err != nil {
 		return nil, err
 	}
+
+	// initialize version params with zero value if not set
+	if paramsProto.Version == nil {
+		paramsProto.Version = &cmtproto.VersionParams{}
+	}
+
 	params := cmttypes.ConsensusParamsFromProto(paramsProto)
 
 	nextParams := params.Update(&consensusParams)