static @Nullable PsiMethod getNullArgConstructor(PsiClass aClass) {
    final PsiMethod[] constructors = aClass.getConstructors();
    for (final PsiMethod constructor : constructors) {
      final PsiParameterList params = constructor.getParameterList();
      if (params.isEmpty()) {
        return constructor;
      }
    }
    return null;
  }
static @Nullable PsiMethod getNullArgConstructor(PsiClass aClass)