Fix config tests

core/chains/evm/config/toml/config.go

@@ -513,6 +513,7 @@ func (t *TxmV2) ValidateConfig() (err error) {
 	if t.Enabled != nil && *t.Enabled {
 		if t.BlockTime == nil {
 			err = multierr.Append(err, commonconfig.ErrMissing{Name: "TxmV2.BlockTime", Msg: "must be set if txmv2 feature is enabled"})
+			return
 		}
 		if t.BlockTime.Duration() < 2*time.Second {
 			err = multierr.Append(err, commonconfig.ErrInvalid{Name: "TxmV2.BlockTime", Msg: "must be equal to or greater than 2 seconds"})

core/services/chainlink/config_test.go

@@ -1477,14 +1477,15 @@ func TestConfig_Validate(t *testing.T) {
 			- Nodes: 2 errors:
 				- 0.HTTPURL: missing: required for all nodes
 				- 1.HTTPURL: missing: required for all nodes
-		- 1: 10 errors:
+		- 1: 11 errors:
 			- ChainType: invalid value (Foo): must not be set with this chain id
 			- Nodes: missing: must have at least one node
 			- ChainType: invalid value (Foo): must be one of arbitrum, astar, celo, gnosis, hedera, kroma, mantle, metis, optimismBedrock, scroll, wemix, xlayer, zkevm, zksync, zircuit, dualBroadcast or omitted
 			- HeadTracker.HistoryDepth: invalid value (30): must be greater than or equal to FinalizedBlockOffset
 			- GasEstimator.BumpThreshold: invalid value (0): cannot be 0 if auto-purge feature is enabled for Foo
 			- Transactions.AutoPurge.Threshold: missing: needs to be set if auto-purge feature is enabled for Foo
 			- Transactions.AutoPurge.MinAttempts: missing: needs to be set if auto-purge feature is enabled for Foo
+			- TxmV2.TxmV2.BlockTime: missing: must be set if txmv2 feature is enabled
 			- GasEstimator: 2 errors:
 				- FeeCapDefault: invalid value (101 wei): must be equal to PriceMax (99 wei) since you are using FixedPrice estimation with gas bumping disabled in EIP1559 mode - PriceMax will be used as the FeeCap for transactions instead of FeeCapDefault
 				- PriceMax: invalid value (1 gwei): must be greater than or equal to PriceDefault
@@ -1515,7 +1516,9 @@ func TestConfig_Validate(t *testing.T) {
 		- 4: 2 errors:
 			- ChainID: missing: required for all chains
 			- Nodes: missing: must have at least one node
-		- 5.Transactions.AutoPurge.DetectionApiUrl: invalid value (): must be set for scroll
+		- 5: 2 errors:
+			- Transactions.AutoPurge.DetectionApiUrl: invalid value (): must be set for scroll
+			- TxmV2.TxmV2.BlockTime: missing: must be set if txmv2 feature is enabled
 		- 6.Nodes: missing: 0th node (primary) must have a valid WSURL when http polling is disabled
 	- Cosmos: 5 errors:
 		- 1.ChainID: invalid value (Malaga-420): duplicate - must be unique