private static @Nullable List<PyRequirement> getListedRequirements(@NotNull PyPackageManager packageManager, @NotNull Module module) {
    final List<PyRequirement> requirements = packageManager.getRequirements(module);
    final List<PyRequirement> extrasRequirements = getExtrasRequirements(module);
    if (requirements == null) return extrasRequirements;
    if (extrasRequirements == null) return requirements;
    return ContainerUtil.concat(requirements, extrasRequirements);
  }
private static @Nullable List<PyRequirement> getListedRequirements(@NotNull PyPackageManager packageManager, @NotNull Module module)