private DependenciesOutputer FilterIfNeeded(bool onlyWithMessages, DependenciesOutputer next)
 {
     if (onlyWithMessages)
         return new OnlyWithMessagesDependenciesOutputer(next);
     else
         return next;
 }
 public OnlyWithMessagesDependenciesOutputer(DependenciesOutputer next)
 {
     this.next = next;
 }