remove uneeded check

discovery/manager.go

@@ -155,11 +155,6 @@ func (m *Manager) updateGroup(poolKey poolKey, tgs []*targetgroup.Group) {
 	done := make(chan struct{})
 
 	m.actionCh <- func(ctx context.Context) {
-		if tgs == nil {
-			close(done)
-			return
-		}
-
 		for _, tg := range tgs {
 			if tg != nil { // Some Discoverers send nil target group so need to check for it to avoid panics.
 				if _, ok := m.targets[poolKey]; !ok {