predicate: Remove duplicate object validation (#47)

Remove duplicate object validation from NoGenerationPredicate.

Author: darkowlzz

predicate/nogeneration.go

@@ -59,10 +59,6 @@ type NoGenerationPredicate struct {
 
 // Update implements the default UpdateEvent filter for validating absence Generation.
 func (NoGenerationPredicate) Update(e event.UpdateEvent) bool {
-	if e.ObjectOld == nil {
-		log.V(1).Info("Update event has no old metadata", "event", e)
-		return false
-	}
 	if e.ObjectOld == nil {
 		log.V(1).Info("Update event has no old runtime object to update", "event", e)
 		return false
@@ -71,10 +67,6 @@ func (NoGenerationPredicate) Update(e event.UpdateEvent) bool {
 		log.V(1).Info("Update event has no new runtime object for update", "event", e)
 		return false
 	}
-	if e.ObjectNew == nil {
-		log.V(1).Info("Update event has no new metadata", "event", e)
-		return false
-	}
 	// Since generation is monotonically increasing, the new generation will always be greater than the old
 	// iff the object respects generations.
 	return e.ObjectNew.GetGeneration() == e.ObjectOld.GetGeneration() && e.ObjectNew.GetGeneration() == 0