@Override
  public void addChildren(PsiClass psiClass, List<? super PsiElement> children) {
    for (PsiClassChildrenSource source : mySources) {
      try {
        source.addChildren(psiClass, children);
      }
      catch (IndexNotReadyException ignore) {
      }
    }
  }
@Override
  public void addChildren(PsiClass psiClass, List<? super PsiElement> children)