Call NewMaxReplicationLagModule to address panic

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

go/vt/throttler/throttler_test.go

@@ -406,9 +406,16 @@ func TestThreadFinished_SecondCallPanics(t *testing.T) {
 
 func TestThrottlerMaxLag(t *testing.T) {
 	fc := &fakeClock{}
-	throttler, _ := newThrottlerWithClock("test", "queries", 1, 1, 10, fc.now)
+	throttler, _ := newThrottlerWithClock("test", "queries", 1, 1, ReplicationLagModuleDisabled, fc.now)
 	defer throttler.Close()
 
+	var err error
+	ratesHistory := newFakeRatesHistory()
+	fc.setNow(1 * time.Second)
+	config := NewMaxReplicationLagModuleConfig(10)
+	throttler.maxReplicationLagModule, err = NewMaxReplicationLagModule(config, ratesHistory.aggregatedIntervalHistory, fc.now)
+	require.NoError(t, err)
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()